10 dan 3 ta qismni n n tanlovi k orqali nCr formulasi bilan tanlash mumkin, n=10, k=3: 10 choose 3 = 10! / (3! (10 - 3)!) = 10! / (3! 7!) = 10 * 9 * 8 / (3 * 2 * 1) = 120 Ya'ni, 3 ta qismni 10 dan tanlashning 120 ta usuli mavjud.
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