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Question
In the following number, replace * by the smallest number to make it divisible by 3:
27*4
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Solution
2724
Here, 2 + 7 + * + 4 = 13 + * should be a multiple of 3.
To be divisible by 3, the least value of * should be 2, i.e., 13 + 2 = 15, which is a multiple of 3.
∴ * = 2
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