Question

Which of the following numbers is not divisible by 8?

• A. 9960
• B. 4512
• C. 7728
• D. 1873

Answer 1

The correct option is D 1873

The divisibility test for 8:
If the number formed by last 3 digits of a number is divisible by 8, then that number is divisible by 8.

9960 is divisible by 8 because 8 completely divides 960.
$(\frac{960}{8}=120)$

4512 is divisible by 8 because 8 completely divides 512.
$(\frac{512}{8}=64)$

7728 is divisible by 8 because 8 completely divides 728 .
$(\frac{728}{8}=91)$

1873 is not divisible by 8 because 873 is not divisible by 8 and leaves 1 as the remainder when divided by 8.