1.The coefficient of x3x^{3}x3 in 301⋅[(1+x)500+x(1+x)499+x2(1+x)498+⋯+x500]301 \cdot \left[(1+x)^{500} + x(1+x)^{499} + x^{2}(1+x)^{498} + \cdots + x^{500}\right]301⋅[(1+x)500+x(1+x)499+x2(1+x)498+⋯+x500] is:a.501C302^{501}C_{302}501C302b.500C301^{500}C_{301}500C301c.500C300^{500}C_{300}500C300d.501C200^{501}C_{200}501C200Login to continueOnly logged in users canattempt or see the solution.
