If \( (1+x)^{n}=C_{0}+C_{1} x+C_{2} x^{2}+\ldots+C_{n} x^{n} \), find the value of
\( \mathrm{P}... VIDEO
If \( (1+x)^{n}=C_{0}+C_{1} x+C_{2} x^{2}+\ldots+C_{n} x^{n} \), find the value of
\( \mathrm{P} \)
\[
\sum_{0 \leq ij \leq n} \sum_{j}(i+j)\left(C_{i}+C_{j}+C_{i} C_{j}\right) .
\]
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\begin{aligned}
\text { If }\left(x+a_{1}\right)\left(x+a_{2}\right)\left(x+a_{3}\right) \ldo...