Question

in how many ways a party of 4 or more can be selected from 10 persons?

Answer 1

It can be selected in 210
nCr=n!/(n-r)!×r!
here,r=4 and n=10
so, nCr=10!/(10-4)!×4!
=6!×7×8×9×10/6!×1×2×3×4
=7×3×10
=210