You can make twenty four 4-digit numbers with the digits 2, 4, 6 and 8 if each digit appears only once. How many of these numbers start with a 2?

Answer 1

3! = 3x2x1 = 6 start with a 2

6 start with 4

6 start with 6

6 start with 8

total = 4x6 = 24 = 4! = 4x3x2x1