Prove the following by mathematical inductionSolutionFn 145
Prove the following by mathematical induction.
Solution
F(n) = 1/4(5^n-1)
we\'ll check for F(1) = 1/4 (4)=1 which is true
We\'ll suposse F(k) is true then 1 + 5 + 52 + ……..+5k-1=1/4(5^k-1)
then F(k+1) should also be true
1 + 5 + 52 + ……..+5k-1+5k+4=1/4(5^(k+1)-1) =
1/4(5^k-1) + 5k+4 = 1/4(5^(k+1)-1)
5k+4 = 1/4(5^(k+1)-1) - 1/4(5^k-1)
5k+4= 1/4 5^k{ (4+1)}
5k+4 = 1/4 5^(k+1)
