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Order is not important, so this is a combination problem.

There are 5 odd numbers from 1 to 10.

n(E) = 5C2 = 5*4/2*1 = 10

n(S) = 10C2 = 10*9/2*1 = 45

P = n(E)/n(S) = 10/45 = 2/9

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Q: What is the probability of 2 odd numbers drawn from 1 through10?
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