how to write d factorial of 2n or n 2n-1...etc terms?

Dear Student!

 Just keep on decreasing the term by one till you get 1.

2n!= 2n(2n–1)(2n–2)(2n–3)(2n–4)......n(n–1)(n–2).....3.2.1

(2n–1)!= (2n–1)(2n–2)(2n–3)(2n–4)......n(n–1)(n–2)......3.2.1

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