The coefficients of the (r-1)^(th),r^(th...

The coefficients of the `(r-1)^(th),r^(th)` and `(r+1)^(th)` terms in the expansion of `(x+1)^n` are in the ratio `1:3:5` .Find n and r.

A

(6,3)

B

(7,3)

C

(5,3)

D

(5,1)

Verified by Experts

The correct Answer is:

B

Similar Questions

Explore conceptually related problems

The coefficients of (r-1)^(th),rh and (r+1)^(th) terms in the expansion of (x+1)^(n) are in the ratio 1:3:5 Find n and r.

The coefficient of the (r-1) th,rth and (r+1) th terms in the expansion of (x+1)^(n) are in the ratio 1:3:5. Find both n and r

If the coefficients of (r-5)^(th) and (2r-1)^(th) terms in the expansion of (1+x)^(34) are equal, find r.

If the coefficients of 5^(th), 6^(th) and 7^(th) terms in the expansion of (1+x)^(n) are in A.P. then n =

If the coefficients of (2r+4)^(th) term and (r-2)^(th) term in the expansion of (1+x)^(18) are equal then r=

(r+1)^(th) term in the expansion of (1-x)^(-4) will be