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OpenStudy (anonymous):
Help please! Which of the following is the third term of the expansion (a + b)^n ? C(n, 2)a^(n - 2)b^2 C(n, 3)a^(n - 3)b C(n, 2)a^2b^(n - 2)
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OpenStudy (anonymous):
a+b)^n = ∑[k = 0 to n] C(n,k) a^(n−k) b^k Third term: n = 2 -----> C(n,2) a^(n−2) b^2
rishavraj (rishavraj):
\[the~~ r^{th} ~~term~~ ~~of~~expansion~~ (a + b)^n~~~is \] \[(n , r - 1) a^{n - (r - 1)}~b^{r - 1}\]
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