Question

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.​

Answer 1

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