hello sir!, i have a dought in a question of binomial theorem(1) Q- find the coefficient of x^20 in (1+3x+3x^2+x^3) - Maths - Mathematical Induction and Binomial Theorem

Question

hello sir!, i have a dought in a question of binomial
theorem(1)
Q- find the coefficient of x^20 in (1+3x+3x^2+x^3)

Sir, you did this question in live class of B T (I) at 51:16 , you
took (x+1)^60 that i got but solve it from (1+x)^60 as my answer is
coming ^60C_20 from that Thanks

Neha Sethi · Accepted Answer

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hello sir!, i have a dought in a question of binomial theorem(1) Q- find the coefficient of x^20 in (1+3x+3x^2+x^3). Sir, you did this question in live class of B.T (I) at 51:16 , you took (x+1)^60 that i got but solve it from (1+x)^60 as my answer is coming ^60C_20 from that. Thanks

hello sir!, i have a dought in a question of binomial theorem(1)
Q- find the coefficient of x^20 in (1+3x+3x^2+x^3).

Sir, you did this question in live class of B.T (I) at 51:16 , you took (x+1)^60 that i got but solve it from (1+x)^60 as my answer is coming ^60C_20 from that. Thanks