Question
If the 4-digit number a34b is exactly divisible by 9, what is the least value of (a +
b)?
Solution
ATQ,
The sum of digits = a+3+4+b = a+b+7
For divisibility by 9, a + b + 7 should be a multiple of 9.
The smallest value of a + b that satisfies this condition is 2.
Thus, least value of (a + b) = 2.
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