Find the different one:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 9900
A number is divisible by 3 when the sum of its digits is divisible by 3.
Option (1) 3085 — digit sum \(3+0+8+5=16\), not a multiple of 3
Option (2) 9900 — digit sum \(9+9+0+0=18\), a multiple of 3 (and of 9), so 9900 is the odd one out: the only number divisible by 3
Option (3) 5116 — digit sum \(5+1+1+6=13\), not a multiple of 3
Option (4) 8179 — digit sum \(8+1+7+9=25\), not a multiple of 3