Question

Please help! Correct answer only please! A student number system for a county requires that the student number be 5 characters. The first 3 characters are any single digit number, but no number can repeat and the last 2 characters must be letters, but no letter can repeat. How many unique student numbers are possible? A. 1,370 B. 131,040 C. 250,000 D. 468,000

Answer 1

D

Explanation:

For the first 3 digits the possibilities are

10*9*8 since there is no repeating

The last two letters possiblities are

26*25

10*9*8*26*25 = 468,000