If the coefficient of rth, (r+1)th and (...

If the coefficient of rth, (r+1)th and (r+2)th terms in the expansion of `(1+x)^(14)` are in A.P., then the value of r is

A

5 or 8

B

4 or 9

C

5 or 9

D

6 or 7

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The correct Answer is:

C

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