Question

The combination of a lock uses numbers 1-10

Each number is only used once and it is a 3 number code.

What is the probability that you will get the combination correct on the first try?
a
1/6
b
3/80
c
1/720
d
1/1000

Answer 1

Answer:If the digit of 0 is allowed, then:

1/(10*9*8)= 1/720

If it is not permitted, then:

1/(9*8*7)= 1/504

I hope this helps you!

Explanation: