Question
If the 4-digit number r76s is exactly divisible by 9,
what is the least value of (r + s)?Solution
ATQ,
The sum of digits = r+7+6+s=r+s+13
For divisibility by 9, r + s + 13 should be a multiple of 9.
The smallest value of r + s that satisfies this condition is 5.
Thus, least value of (r + s) = 5.
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