RBI Assistant Prelims 2016 Sitting 4 Paper

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