1. Find a, b and n in the expansion of 
if the first three terms of the expansion are 729, 7290 and 30375, respectively.
if the first three terms of the expansion are 729, 7290 and 30375, respectively. 1. Find a, b and n in the expansion of if the first three terms of the expansion are 729, 7290 and 30375, respectively.
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