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Question

If (1+x+x2++xn)n =a0+a1x+a2x2++ampxmp then a1+2a2+3a3++npanp=_______

A
np4(p+1)n
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B
np4(p+3)n
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C
np2(p+3)n
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D
np2(p+1)n
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Solution

The correct option is D np2(p+1)n

(1+x+x2+...+xp)n=a0+a1x+...+apnxpn

Differentiating wrt x

n(1+x+x2+...+xp)n1×(1+2x+3x2+...+pxp1)=a1+2a2x+...+pnapnxpn1

Put x=1

n(p+1)n1p(p+1)2=a1+2a2+...+apn

=np2(p+1)n


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