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The coefficient of x^5 in (1 + x)^8 is

A8
B28
C56
D70
Answer & Solution
Correct answer: C. 56
⁸C_5 = ⁸C_3 = 8! We have / (3! · 5!) = (8·7·6)/(3·2·1). So / (3! · 5!) = 56.
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