Question

A company places a seven-digit serial number on each part that is made. Each digit of the serial number can be any number from 0 through 9. Digits can be repeated in the serial number. How many different serial numbers are possible?

Answer 1

Answer: 10,000,000 different numbers are possible.

Step-by-step explanation:

Given: Serial number is of 7 digits.

Choices for digits = 10  (0 to 9)

If digits can be repeated, then by Fundamental principle of counting,

The  different serial numbers are possible =  $10^7$

= 10,000,000

Hence, the different serial numbers are possible = 10,000,000