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Cards bearing numbers 2, 4, 6, 8, 10, 12...

Cards bearing numbers 2, 4, 6, 8, 10, 12, 14, 16, 18 and 20 are kept in a bag. A cord is drawn at random from the bag. Find the probability of getting a card which is
a prime number.

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The correct Answer is:
`1/(10)`
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