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| 1. |
IF nC8=nC2 find nC2 |
| Answer» nCr=nCn-rnC8=nCn-28=n-2n=10nCr=n!/(n-r)! r! 10C2=10!/(10-2)!2!=10*9*8!/8!*2*1=10*9/2=45 | |