If , for which value of is…

MATHEMATICS · Single correct · A Level · Mathematics · Sequences and series · Sequences and series

Problem

If 2nC3:nC2=44:3{}^{2n}C_3:{}^nC_2=44:3, for which value of rr is nCr=15{}^nC_r=15? (1) r=3r=3 (2) r=4r=4 (3) r=5r=5 (4) r=6r=6

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