a box contains 20 cards numbered from 1 to 20 . a card is drawn at random from the box . find the probability that the number on the drawn card is (a) 2 or 3 (b) a prime no.
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Answer:the total no. Of out comes =20
No of favourable outcomes for prime number=8
So now 8/20=2/5
By using probability forumala
No. Of out comes for2or3=3
Now
Probability =3/20
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