Question

Choose the number which is DIFFERENT from the rest? 28 45 81 72

Answer 1

Answer:

28...because not divisible by 9..

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Answer 2

The number 28 is different.

Given:

A set of four numbers 28, 45, 81, 72.

To Find:

Which number is different from the rest.

Solution:

• Divisibility rule for 3: If the sum of its digits is divisible by  then number is completely divisible by 3
• Divisibility rule for 9: If the sum of its digits is divisible then the number is completely divisible by 9.
• In the given set of numbers, only 28 exists that are not divisible by 3 as well as 9.
• Therefore, the number 28 is different from the rest in the given set.

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