If \( (1+x)^{n}=C_{0}+C_{1} x+C_{2} x^{2}+C_{3} x^{3}+C_{n} x^{n} \... VIDEO
If \( (1+x)^{n}=C_{0}+C_{1} x+C_{2} x^{2}+C_{3} x^{3}+C_{n} x^{n} \), prove
\( \mathrm{P} \)
that
W
\[
C_{0}+2 C_{1}+3 C_{2}+\ldots . .+(n+1) C_{n}=(n+2) 2^{n-1}
\]
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