Answer :
The way you wrote it, it should be 60.
But the way I think you meant to write it was [tex](3)(7 ^{n-1} )[/tex]
Which in this case, 3-1=2 so (3)([tex]7 ^{2} [/tex])=147
But the way I think you meant to write it was [tex](3)(7 ^{n-1} )[/tex]
Which in this case, 3-1=2 so (3)([tex]7 ^{2} [/tex])=147
