निम्नलिखित के मान ज्ञात कीजिएः
(i) `5!` (ii) `7!` (iii) `7!-5!` (iv) `(7!)/(5!)` (v) `(12!)/(10!2!)`

Explanation

(i) `5"!"=5xx4xx3xx2xx1=120`
(ii) `7"!"=7xx6xx5xx4xx3xx2xx1=5040`
(iii) `7"!"-5"!"=5040-120=4920`
(iv) `(7!)/(5!)=5040/120=42`
(v) `(12!)/(10!.2!)=(12.11.10!)/(10!.2!)=(12xx11)/2=66`