Problema Solution
The code for a lock consist of 5 digits. The last number cannot be 0 or 1. How many different codes are possible?
Answer provided by our tutors
there are 10 different digits that can be placed in the first 4 positions: 0,1,2,3,4,5,6,7,8,9
the 5th position, or the last number has 8 possibilities: 2,3,4,5,6,7,8,9
the number of possible codes is:
10*10*10*10*8 = 80,000 different codes.