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These are always difficult for me; I always end up using trial and error. In this particular case, here is a way to get 39 out 1, 2, 3 and 4:

42 - 31

If you are not allowed to use exponents, then there is:

31 + 4 * 2

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11y ago
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Q: How do you get the number 39 using only 1 2 3 and 4?
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