-80
10
40
90
Correct answer is C
x3y2 in (x-2y)5
n = 5, r = 3, p = x, q = -2y
5C3 * x3 -2y2
5C3 = 5![5−3]!3!
5∗4∗3!2!3! → 5∗42
5C3 = 10
: 5C3 * x3 -2y2 = 10 * x3 4y2
40x3y2
the coefficient is 40
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