Question

Stacy needs to make a security code composed of two letters that cannot repeat followed by 4 digits that cannot repeat. How many codes can she make

Answer 1

Since repetition is not allowed in this question, then we will use the permutation

Since Stacy needs the code from 2 letters and 4 digits

Since there are 26 letters and 10 digits, then

The number of codes = 26 x 25 x 10 x 9 x 8 x 7 = 3276000

Then there are 3276000 codes