Hi,

nCx = 

10C6 = 10!/6!*4! =  10*9*8*7/4*3*2 = 30*7 =  210

12C8 = 12!/8!*4! = 495

14C10 = 14!/10!*4! = 14*13*12*11/4*3*2 = 7*13*11 = 1001 

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