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NCERT 11th Maths

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eduhilfe
Asked: August 22, 2020In: NCERT 11th Maths

20. By using the concept of equation of a line, prove that the three points (3, 0), (– 2, – 2) and (8, 2) are collinear.

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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

10. The number lock of a suitcase has 4 wheels, each labelled with ten digits i.e., from 0 to 9. The lock opens with a sequence of four digits with no repeats. What is the probability of a person getting the right sequence to open the suitcase?

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  • 19 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

9. If 4-digit numbers greater than 5,000 are randomly formed from the digits 0, 1, 3, 5, and 7, what is the probability of forming a number divisible by 5 when,

(i) the digits are repeated? (ii) the repetition of digits is not allowed?

  • 0 Answers
  • 14 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

8. From the employees of a company, 5 persons are selected to represent them in the managing committee of the company. Particulars of five persons are as follows:

A person is selected at random from this group to act as a spokesperson. What is the probability that the spokesperson will be either male or over ...

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  • 17 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

7. A and B are two events such that P(A) = 0.54, P(B) = 0.69 and P( A ∩ B ) = 0.35. Find (i) P( A ∪ B ) (ii) P( A ́ ∩ B ́ ) (iii) P ( A ∩ B ́ ) (iv) P( B ∩ A ́ )

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  • 25 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

6. Three letters are dictated to three persons and an evelope is addressed to each of them, the letters are inserted into the envelopes at random so that each envelope contains exactly one letter. Find the probability that at least one letter is in its proper envelope.

  • 0 Answers
  • 20 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

5. Out of 100 students, two sections of 40 and 60 are formed. If you and your friend are among the 100 students, what is the probability that

(a) you both enter the same section? (b) you both enter the different sections?

  • 0 Answers
  • 17 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

4. In a certain lottery 10,000 tickets are sold and ten equal prizes are awarded. What is the probability of not getting a prize if you buy (a) one ticket (b) two tickets (c) 10 tickets.

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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

3. A die has two faces each with number ‘1’, three faces each with number ‘2’ and one face with number ‘3’. If die is rolled once, determine

(i) P(2) (ii) P(1 or 3) (iii) P(not 3)

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  • 12 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

2. 4 cards are drawn from a well – shuffled deck of 52 cards. What is the probability of obtaining 3 diamonds and one spade?

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  • 15 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

1. A box contains 10 red marbles, 20 blue marbles and 30 green marbles. 5 marbles are drawn from the box, what is the probability that

(i) all will be blue? (ii) atleast one will be green?

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  • 17 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

21. In a class of 60 students, 30 opted for NCC, 32 opted for NSS and 24 opted for both NCC and NSS. If one of these students is selected at random, find the probability that

(i)  The student opted for NCC or NSS. (ii)  The student has opted neither NCC nor NSS. (iii)  The student has opted NSS but not NCC.

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  • 23 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

20. The probability that a student will pass the final examination in both English and Hindi is 0.5 and the probability of passing neither is 0.1. If the probability of passing the English examination is 0.75, what is the probability of passing the Hindi examination?

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  • 22 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

19. In an entrance test that is graded on the basis of two examinations, the probability of a randomly chosen student passing the first examination is 0.8 and the probability of passing the second examination is 0.7. The probability of passing atleast one of them is 0.95. What is the probability of passing both?

  • 0 Answers
  • 20 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

18. In Class XI of a school 40% of the students study Mathematics and 30% study Biology. 10% of the class study both Mathematics and Biology. If a student is selected at random from the class, find the probability that he will be studying Mathematics or Biology.

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  • 15 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

17. A and B are events such that P(A) = 0.42, P(B) = 0.48 and P(A and B) = 0.16. Determine (i) P(not A), (ii) P(not B) and (iii) P(A or B)

  • 0 Answers
  • 16 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

16. Events E and F are such that P(not E or not F) = 0.25, State whether E and F are mutually exclusive.

  • 0 Answers
  • 18 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

15. If E and F are events such that P(E) = \frac{1}{4} , P(E) = \frac{1}{2} and P(E and F) = \frac{1}{8} , find

(i) P(E or F), (ii) P(not E and not F).

  • 0 Answers
  • 14 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

14. Given P(A) = \frac{3}{5} and P(B) = \frac{1}{5} . Find P(A or B), if A and B are mutually exclusive events.

  • 0 Answers
  • 13 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

13. Fill in the blanks in following table:

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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

12. Check whether the following probabilities P(A) and P(B) are consistently defined

(i) P(A)=0.5, P(B)=0.7, P(A∩B)=0.6 (ii) P(A)=0.5,P(B)=0.4,P(A∪B)=0.8

  • 0 Answers
  • 11 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

11. In a lottery, a person choses six different natural numbers at random from 1 to 20, and if these six numbers match with the six numbers already fixed by the lottery committee, he wins the prize. What is the probability of Winning the prize in the game.

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  • 15 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

10. A letter is chosen at random from the word ‘ASSASSINATION’. Find the probability that letter is (i) a vowel (ii) a consonant

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  • 13 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

9. If \frac{2}{11} is the probability of an event, what is the probability of the event ‘not A’.

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  • 17 Views
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eduhilfe
Asked: September 4, 2020In: NCERT 11th Maths

8. Three coins are tossed once. Find the probability of getting

(i) 3 heads (ii) 2 heads (iii) atleast 2 heads (iv) atmost 2 heads (v) no head (vi) 3 tails (vii) exactly two tails (viii) no tail (ix) atmost two tails

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