Correct Answer - Option 4 : 17
Concept Used
Divisibility Rule of 3 is the sum of digit of number is divisible by 3 then whole number should divisible by 3
Calculation
The sum of digit = 2 + 3 + M + N + 5
⇒ 10 + M + N
We know the multiple of 3 is 12, 15, 18, 21, 24, 27
⇒ 10 + M + N = 27
⇒ For maximum, M + N = 17
∴ The maximum value of M + N is 17
