
### Instruction: help me answer this question 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., think step by step
### Assistant: We have used the formula (r + 1)th term, (T(r+1)) in the binomial expansion of (a + b)n is given by T(r+1) = nCr an-t br. After equating the three given terms with the first three terms of the expansion and solving the equations, we got a = 3, b = 5 and n = 76 , The answer is a = 3, b = 5 and n = 76
