Cryptex 300 Combinations!

Somebody asked for a Cryptex ... so here\\\'s a simple Cryptex with only 300 combinations ... I think the math is right ... for one ring;

Programming the combination is the little key tabs that slip into 1 of 3 positions for each of the 5 circular positions on a ring and there are 5 rings, with 5 choices each.

n P k = n!/(n-k)! = (5!/(5-3)! = 60 and with 5 rings = 300 combinations.

So much confusion on the math ... I'll look into it more ...

I just realized that if I use more ring