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12 May, 03:39

John rolls a number cube twice. What is the probability that the sum of the 2 rolls is less than 7, given that the first roll is a 1?

one over six

one over three

one over two

five over six

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  1. 12 May, 04:00
    0
    The probability would be 5/6.

    There are 6 ways we can roll two dice and have the first number be a 1:

    1, 1

    1, 2

    1, 3

    1, 4

    1, 5

    1, 6

    Out of these, 5 possibilities give us a sum less than 7:

    1, 1

    1, 2

    1, 3

    1, 4

    1, 5

    Thus we have 5/6.
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