Maths Induction Divisibility Type Question (1 Viewer)

[ben_1234]

This question is annoying me so much, need some help.

"Prove by mathematical induction that (3n+1).7^(n)-1 is divisible by 9 for integers n≥1"

When you test n=1 the result is 27 just to make clear how its meant to be written

 

[Deliriously]

Test n=1
(3(1)+1).7^(1)-1
=27
which is divisible by 9

thats all

 

[ben_1234]

Thank you so much for your amazing help! I ended up working it out anyway

 

[ben_1234]