Aptitude Day 139

Problems on Probability:

1. The probability that a card drawn from a pack of 52 cards will be a Heart or a Jack, is:

Solution:

               We’ve 13 Hearts which include 1 Jack. Plus we’ve 3 more Jacks.

                 So their total will be 13+3 = 16.

                 P(E) = n(E)/ n(S)

                         = 16/52

                         = 4/13.

2. From a pack of 52 cards, 2 cards are drawn together at random. What’s the probability of both the cards being Queens?

Solution:

                n(S) = ⁵²C2 = 1326

                n(E) = ⁴C2 = 6

                P(E) = n(E)/ n(S)

                         = 6/1326

                         = 1/221.