21q2x5
21q4x3
35q3x4
35q5x2
Correct answer is C
rth term of a binomial expansion = nCr−1an−(r−1)br−1
n = 7, r = 5 ∴ r - 1 = 4
5th term = 7C4q7−4x4
= 7C4q3x4
∴
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