Pxarmple9 The coefficients oi three consecultive terms in the expansio – InterviewSolution

1.

Pxarmple9 The coefficients oi three consecultive terms in the expansion of ( + aare in the ratiol: 7:42. Find n.

Answer»

nCr-1: nCr:nCr+1 =1:7:42

r/(n-r+1) = 1/7

8r = n + 1

(r+1)/(n-r) = 7/42 = 1/6

7r = n - 6

r = 7

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