Ukukhetha abantu abangu-4 eqenjini labangu-10

Zingaki izindlela zokukhetha abantu abangu-4 eqenjini labangu-10? Uma ukulandelana kubalulekile, lawa ngamaphemutheshini: $\displaystyle {}_{n}P_{r}$ ingumbhalo ophuzi ophezu kwenkinobho yokuphindaphinda. Thayipha 10, cindezela , uthayiphe 4, : 5040. Uma ukulandelana kungabalulekile, lawa ngamakhombineshini: $\displaystyle {}_{n}C_{r}$ uphezu kwenkinobho yokuhlukanisa. Thayipha 10, cindezela , uthayiphe 4, : 210.

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