Im slighty confused on how to calculate this.

Password must have length between 6 and 8.

Each password contains at least 1 digit [0-9].

Other characters either upper case or lower case.

So we have 62 different possiblities in each position, am i correct?

im thinking something like 62^6 + 62^7 + 62^8.

or 62! / 8! + 62! / 7! + 62! / 6!.

Please help me!