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28 June, 13:28

A die is rolled twice. what is the probability that the sum of the rolls is less than 4 given that one of the rolls is a 1?

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  1. 28 June, 14:51
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    First let's see in how many way we can get a sum <4

    well first role is 1

    second role can be 1, 2, 3, 4, 5, 6

    we can have this combinations

    (1,1) (1,2) (1,3) (1, 4) (1, 5) (1, 6)

    out of all this only 1,1 and 1,2 add up to less than 4

    so 2/6=1/3
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