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A : If the coefficients of 5th, 6th , 7t...

A : If the coefficients of 5th, 6th , 7th terms of `(1+x)^n` are in A.P. then `n=7 or 14.`
R : If the coefficients of rth, `(r+1)th, (r+2)th` terms of `(1+x)^n` are in A.P. then `n^2-(4r+1) n+4r^2 = 2.`

A

Both A and R are true and R is the correct explanation of A

B

Both A and R true but R is not correct explanation of A

C

A is true but R is false

D

A is false but R is true

Text Solution

Verified by Experts

The correct Answer is:
A
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