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

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It is known that (r + 1)th term, (Tr+1), in the binomial expansion of (a + b)n is given by

The first three terms of the expansion are given as 729, 7290, and 30375 respectively. 

Therefore, we obtain

Dividing (3) by (2), we obtain

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