Evalute the following:
`(12!)/(10! xx 2!)`

Explanation

(i) We have `7 !/5 !=7 xx 6 xx 5 !/5 !=7xx6=42`

and
(ii) `12 !/(10 !)(2 !)=12 xx 11 xx(10 !)/(10 !) xx(2)=6 xx 11=66`