The security code to your home security system includes three single digit numbers and two letters. Repetition is allowed for the numbers but not allowed for the letters.

Question

Trying to find number of combinations

Answer 1

26 * 25 * 10 * 10 * 10 +

26 * 10 * 25 * 10 * 10 +

26 * 10 * 10 * 25 * 10 +

26 * 10 * 10 * 10 * 25 +

10 * 26 * 25 * 10 * 10 +

10 * 26 * 10 * 25 * 10 +

10 * 26 * 10 * 10 * 25 +

10 * 10 * 26 * 25 * 10 +

10 * 10 * 26 * 10 * 25 +

10 * 10 * 10 * 25 * 26 = ?