Xavier Aptitude Test 2017 Paper

Question : 52 of 97

Marks: +1, -0

A dice is rolled twice. What is the probability that the number in the second roll will be higher than that in the first?

5/36
8/36
15/36
21/36
None of the above

Validate

Solution:

(c)Total favourable rolls = 6 x 6 = 36
Number on the second roll is higher than the first.
So, to satisfy this condition select any 2 numbers out
of 6 number is 6C2 ways.
Hence required probability =

^{6} {C}_{2} /{36}=\ {15}/{36}

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