Expanding (1+x)^n (Edexcel IAL P4 4.1)

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Pearson Edexcel IAL Pure Mathematics 4 Unit 4.1 Expanding (1+x)^n
Unit 4 - Binomial Expansion

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Sir, at 20:49, shouldn't the coefficient of the x^3 term be 625/16? correct me if I'm wrong.

javedfaizal
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I'm enjoying your videos very much you explain the concepts really well! Will you be doing the mechanics m1 syallabus? thanks

elonmusk
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8:21 why can't we use NCR formula?

Mahif_