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... or 40

no, 40 is the wrong answer

The solution which results in 40 is just as convincing as the one which makes 96, really.

An question with two possible answer. Its sure, question mistake.

For 40, explanation,
1+4=5
2+5=12 (2+5+answer from above equation i.e. 5)
3+6=21 (3+6+answer from above equation i.e. 12)
8+11=40 (8+11+answer from above equation i.e. 21).

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