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16 April, 11:39

The tickets in a box are numbered from 1 to 20 inclusive. If a ticket is drawn at random and replaced, and then a second ticket is drawn at random, what is the probability that the sum of their numbers is even? 1/2 1/4 1/5

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  1. 16 April, 15:15
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    What can happen with equal probability is:

    even + even = even

    even + odd = odd

    odd + even = odd

    odd + odd = even

    So as much chance of even as for odd. The chance will be 1/2.
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