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RBI Assistant Prelims 2016 Sitting 4 Paper
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© examsnet.com
Question : 48
Total: 100
A bag contains 63 cards (numbered 1, 2, 3, ....... 63). Two cards are picked at random from the bag (one after another and without replacement), what is the probability that the sum of numbers of both the cards drawn is even?
11/21
34/63
7/11
11/63
Other than those given as options
Validate
Solution:
The sum of numbers on both cards will be even if both cards bear either even or odd numbers.
Even numbers from 1 to 63 = 31,
Odd numbers = 32
When both cards are odd, Required probability
=
32
63
×
31
62
=
16
63
When both cards are even, Required probability
=
31
63
×
30
62
=
15
63
Required total probability
=
16
63
+
15
63
=
31
63
© examsnet.com
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