find the value of n no. 20
Attachments:
Answers
Answered by
1
25^n-1 +100 =5^2n-1
(5^2)^n-1. +100 = 5^2n-1
5^2n-2 + 4×5^2 =5^2n-1
divide by 5^2
5^2n-4 + 4. =5^2n-3
it is only possible 1+ 4 =5
5^2n-4 =5^0 =1
2n -4 =0
2n =4
n =2
Similar questions