Prove that : 4nC2n : 2nCn = [1 . 3 . 5 …. (4n – 1)] : [1.3.5….. (2n – 1)]2.
Given that we need to prove:
4nC2n : 2nCn = [1 . 3 . 5 …. (4n – 1)] : [1.3.5….. (2n – 1)]2.
Consider L.H.S:
We know that
And also n! = n(n – 1)(n – 2)…………2.1
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⇒
= R.H.S
∴ L.H.S = R.H.S, thus proved.