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Question
If we check the divisibilty by first 20 natural numbers, by which number is 129 divisible?
- 3
- 3
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Solution
The correct option is A 3
Divisibility test for 3:
If the sum of digits of a number is divisible by 3, then the number is also divisible by 3.
For 129
1 + 2 + 9 = 12
Since, 12 is divisible by 3
∴ 129 is divisible by 3.
Other than 3, 129 is not divisible by any other number.
Divisibility test for 3:
If the sum of digits of a number is divisible by 3, then the number is also divisible by 3.
For 129
1 + 2 + 9 = 12
Since, 12 is divisible by 3
∴ 129 is divisible by 3.
Other than 3, 129 is not divisible by any other number.
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