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7 August, 03:47

Jack rolls a number cube twice. What is the probability that the sum of the 2 rolls is less than 8 given that the first roll is a 4?

one over two

one over six

one over three

five over six

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  1. 7 August, 06:33
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    If the first roll is a 4, the possibilities to add less than 8 are that the second cube roll is 1, 2 or 3.

    These are 3 different events out of 6 possilbe ones, which is 3 / 6 = 1 / 2; i. e. half of times.

    Then the answer is the first option: 1 / 2
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