Question

4. Find n if, (a) (n + 1)! = 20(n - 1)!
(b) (n+2)!=12.n!​

Answer 1

Answer:

(a) (n+1)=20n-20

= 1+20=20n-n

= 21=19n

= n=21/19

(b) (n+2)=12n

= 2=12n-n

= 2=11n

= n=11/2

Hope it helps :)