Binomial series: Lecture 5: Sum of all the coefficients in the expansion

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Binomial series: Lecture 5: Sum of all the coefficients in the expansion. Find the sum of coefficients in the expansion of (a+b+c+d)^8 in terms containing b but not c Support the channel:
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sir t 2:45 why didnt we put x=[-1] for vanishing the sum it could give us alpha=-1

priyadarshangarg