Question

(n+1)!/(n-1)!=20

n!=?

Answer 1

the expression (n+1)!/(n-1)! should be part of an equality

Answer 2

(n+1)!/(n-1)! = RHS

Answer 3

RHS?

Answer 4

right hand side
(LHS) x = y (RHS)

Answer 5

try n^2+n

put values

Answer 6

(n+1)!/(n-1)!=20

n!=?

Answer 7

any1?

Answer 8

like I said, try n^2+n

Answer 9

The trivial method is to find 'n' and then solve n! , as panlac01 said.
Method 1:
(n+1)!/(n-1)!=20
(n+1)n. (n-1)! / (n-1)! = 20
(n+1)n = 20
or n^2 + n = 20

Answer 10

solve for N for the answer?

Answer 11

OR
Method 2:
(n+1)!/(n-1)! = (n+1) n! / (n-1)! .....................eqn (A)
||
20 = 5*4
= 5 * 4 *(3!) / (3!) [Multiply and divide by 3!]
= 5 * 4! / 3!
[Now this is the same form as the RHS of eqn (A)]

You can compare n! = 4! =24 (SOLUTION}

Answer 12

thank u. the "!" confuesd me. thanx for the help, bro!

Answer 13

np