Question

How many different 4-digit sequences can be formed using the digits 0, 1,..., 6 if repetition of digits is allowed

Answer 1

Answer:D.2401

Explanation:

I took the quiz

Answer 2

0 through 6 is 7 total numbers

1st digit can be 0-6 = 7 numbers

2nd digit can be 0-6 = 7 numbers

3rd digit can be 0-6 = 7 numbers

4th digit can be 0-6 = 7 numbers

7 * 7 *7 *7 = 2401 different combinations