Not sure at all... I found a few patterns and they lead me to 43. I somehow don't think it's the correct answer.
The answer I found was also 43.
You add 20, then subtract 1. Then add 20, then subtract 1.
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Ten.
75 Pattern: times 3, divided by 2, plus 1
It is 25 because as a composite number it has more than two factors
what number comes next 1 -8 -16 -24 -33
25