Question

How many 4-digit odd numbers can you make using the digits 1 to 7 if the numbers must be less than 6000? No digits are repeated.​

Answer 1

5 x 5 x 5 x 4 = 5000

Answer 2

600

Explanation:

The number has 4 digits.

The first digit can be 1, 2, 3, 4, 5.

The second through fourth digits can be 1, 2, 3, 4, 5, 6, 7.

There are 5 choices for the first digit, 6 choices for the second digit, 5 choices for the third digit, and 4 choices for the fourth digit.

5 × 6 × 5 × 4 = 600