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96 It's old, and well known problem.

a+ab

sorry not 40

I think you make a mistake

1+4=5
2+5=12
3+6=21
4+7=32
5+8=45
6+9=60
7+10=77
8+11=96

i believe what you did was 8+11+21, anyways Kudos!!!

Try again

8 + 11 = 8 × 11 + 8 = 96

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