What should come in place of the question mark ‘?’ in the given series? 81, 84, 90, 99, 111, ?
Solution
✅ Correct Option: 3
The differences are: $84-81=3$, $90-84=6$, $99-90=9$, $111-99=12$. The increments increase by 3 each time, so the next increment is 15. $111+15=126$.
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