Question

nCr+4.nCr-1+6.nCr-2 +4.nCr-3 +nCr-4
a) n+4Cr
b) 2.(n+4)Cr-1
c) 4.nCr
d) 11.nCr
i need the ans as soon as possible i need it with step by step solution pleaseee​

Answer 1

Answer:

option (b) I think

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