Question

n! + (n-1)! = 30 then find the value of n

Answer 1

let the number n=15.5
n+(n-1)=30
15.5+(15.5-1)=30
15.5+14.5=30
30.0=30
30=30

n=15.5 answer

Answer 2

n!+(n-1)!=30
n!=30-(n-1)!
n×(n-1)!=30-(n-1)!
n=[30-(n-1)!]/(n-1)!
n=30/(n-1)! -( n-1)!/(n-1)!
n= 30/(n-1)!
n!=30