Find the value of n if
(i) ` ( n + 1) ! = 20 ( n-1 ) ! `
( ii) ` 1/( 8!) + 1/( 9 !) = n/( 10 !)`

Find the value of n , if ((n - 1)!)/(n!) = 1/9

Find the value of : (1+i)^n, n inN

Find the value of n if: 2n! n! =(n+1)(n-1)(!(2n-1)!

Find the value of n if (n)/(11!) = (1)/(9!) +(1)/(10!) .

Find the value of n if (n)/(11!) = (1)/(9!) +(1)/(10!) .

Find the value of .^(n-1)C_(n-1)

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)! .

Find the value of ( i^2 + n ) ( i^2 + n - 1 ) ( i^2 + n - 2 ) .......( i^2 + 1 )