Answer:
42
Explanation:
40=2x5x2x2
41=1x41
42=2x7x3
43=1x43
The number is 42 because if you look at the factors that are used to multiply to get to 42, it has both 2 and 7 as their factors. (hope you understood this...and i'm sorry if its wrong)
I'm pretty sure the answer is 44.
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