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प्रश्न
Cards marked with numbers 1, 2, 3 ......... 20 are well shuffled and a card is drawn at random. What is the probability that the number on the card is a prime number?
बेरीज
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उत्तर
Total possible outcomes = 20
Favorable outcomes for a prime number = 2, 3, 5, 7, 11, 13, 17, 19
Number of favorable outcomes = 8
P(a prime number) = `8/20 = 2/5`
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