What is the least number of moves in the tower of Hanoi puzzle with 7 disks?

Matty D: What is the least number of moves in the tower of Hanoi puzzle with 7 disks?
The answer would help greatly. Also if at all possible are there any websites that show how to do the 7 disc puzzle?

Answers and Views:

Answer by manjyomesando1
formula = 2^n – 1
answer = 2^7 – 1 = 127