Q1. Find a, b and n in the expansion of if the first three terms of the expansion are 729, 7290 and 30375, respectively.
As we know the Binomial expansion of is given by
Given in the question,
Now, dividing (1) by (2) we get,
Now, Dividing (2) by (3) we get,
Now, From (4) and (5), we get,