Question
rth term in the expansion of (a+2x)n is
Answer: Option B
:
B
rth term of (a+2x)n isnCr−1(a)n−r+1(2x)r−1
= n!(n−r+1)!(r−1)!an−r+1(2x)r−1
=n(n−1).....(n−r+2)(r−1)!an−r+1(2x)r−1
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:
B
rth term of (a+2x)n isnCr−1(a)n−r+1(2x)r−1
= n!(n−r+1)!(r−1)!an−r+1(2x)r−1
=n(n−1).....(n−r+2)(r−1)!an−r+1(2x)r−1
Was this answer helpful ?
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