10
40
32
80
Correct answer is A
(x+2x2)5
n = 5, r = 4, p = x and q = 2x2
5C4x4 (2x2)1 = 5C4 2x4x2
5C4 2x2 = 5![5−4]!4! * 2x2
5∗4!4!∗2x2 = 5 * 2x2 = 10x2
The coefficient is 10.
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