2^31 = 2,147,483,648
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31
First of all, 31 is 3. Now 3-2 is 1/32, which is 1/9. So the answer is 3/9, or 1/3. If by positive indices you mean positive exponents, that would be 1/31, because 1 plus -2 is -1, so you get 3-1 which is 1/31.
(1/2) / (31/5) = (1/2) * (31/5) = 31/10 = 3.1
1 x 31, 2 x 31/2 , 3 x 31/3 etc. 31 is a prime number.
Very simple answer. ((4³) ÷ 2) - 1 = 31. Let's check out equation to verify its solution is the desired number. ((4³) ÷ 2) - 1 = 31 (64 ÷ 2) - 1 = 31 32 - 1 = 31 31 = 31.