What is the coefficient of the last term in the binomial expansion of open paren x plus 1 close paren to the 9th power ?
Answer
A
0
B
10
C
9
D
1
Explanation
In the expansion of (x + 1)^9, the last term comes from choosing 1 from all nine factors. That term is 1^9 = 1, so its coefficient is 1. The correct choice is D) 1.
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