2. A box contains cards numbered 3,5,7,9,..., 35, 37. A card is drawn at
random from the box. Find the probability that the number on the card
is a prime number.
[CBSE 2013]
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Answer: 11/18.
No. of outcome: 18
Favourable outcomes: 3,5,7,11,13,17,23,29,31,37.........i.e. 11 outcomes.
Therefore, P (of getting a prime no.)=11/18
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