(a)Compute (i) `(20!)/(18!)` (ii) `(10!)/(6!.4!)` (b)find n if `(n+2)! =2550*n!`

Find n , if (n+2)! =2550xxn !

If (n+2)!=2550n!, then n

IF (n + 2)! = 2550 n! find n .

If (n+2)! =(2550)(n!), find n.

Find the value of n if: (i) (n+2)! = 12n! (ii) (n+2)! = 60(n-1)! (iii) (n+3)! = 2550 (n+1)! (iv) (n-2)! = 132. (n-4)! .

Evaluate : (i) 2 xx 6! - 3 xx 5! (ii) (8!)/(4!) (iii) (20!)/(18!(20 - 18)!)

Evaluate. (i) i^(1998) (ii) i^(-9999) (iii) (-sqrt-1)^(4n+3) ,n ne N

Evaluate. (i) i^(1998) (ii) i^(-9999) (iii) (-sqrt-1)^(4n-3) ,n ne N

Evaluate. (i) i^(1998) (ii) i^(-9999) (iii) (-sqrt-1)^(4n=3) ,n ne N