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Find the fifth term in the binomial expansi...

Find the fifth term in the binomial expansion of (q+x)7.

A.

21q2x5

B.

21q4x3

C.

35q3x4

D.

35q5x2

Correct answer is C

rth term of a binomial expansion = nCr1an(r1)br1

n = 7, r = 5 ∴ r - 1 = 4

5th term = 7C4q74x4

= 7C4q3x4