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You have to multiply the bottom number by the whole number. then add it to the top number. EX: 1/2+3=7/2
Two numbers that multiply to give -1 are -1 and 1.
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Let E1 and E2 be two even numbers. Then (E1+1)(E2+1) will be the product of two odd numbers. We have E1*E2 +E2+E1+1. Now when we add or multiply even numbers, we get even numbers and we add 1, it's odd.