If the coefficients of 5th, 6th , and 7t...

If the coefficients of 5th, 6th , and 7th terms in the expansion of `(1+x)^n` are in A.P., then `n=` a. 7 only b. 14 only c. 7 or 14 d. none of these

A

7only

B

14 only

C

7 or 14

D

None of these

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The correct Answer is:

c

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