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प्रश्न
In the following number, replace M by the smallest number to make resulting number divisible by 11: 3M422
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उत्तर
The given number = 3M422
Sum of its digits in odd places = 3 + 4 + 2 = 9
Sum of its digit in even places = M + 2
Difference of the two sums = 9 – (M + 2)
9 – (M + 2) = 0
9 – 2 = M
M = 7
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