Question
If the 4-digit number m52n is exactly divisible by 9,
then what is the least value of (m + n)?Solution
ATQ,
For divisibility by 9, the sum of its digits must be a multiple of 9.
m+5+2+n=m+n+7
For divisibility by 9, m + n + 7 should be a multiple of 9.
The smallest value of m + n that satisfies this condition is 2.
Thus, least value of (m + n) = 2.
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