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Question
In the following number, replace * by the smallest number to make it divisible by 9:
6678*1
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Solution
667881
Here, 6 + 6 + 7 + 8 + * + 1 = 28 + * should be a multiple of 9.
To be divisible by 9, the least value of * should be 8, i.e., 28 + 8 = 36, which is a multiple of 9.
∴ * = 8
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