Tom rolls a number cube twice. What is the probability that the sum of the 2 rolls is less than 9 given that the first roll is a 6?

Question

Cristopher Mcgee

Mathematics

11 April, 19:31

Tom rolls a number cube twice. What is the probability that the sum of the 2 rolls is less than 9 given that the first roll is a 6?

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Answers (2)

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Jamari Roach · Answer 1

Since the that the first roll is a 6, so the second must be 1 or 2,

so p = 2/36=1/18

Emerson Griffith · Answer 2

For the sum to be less than 9, sum of two rolls is 7 or 8.

Since the first roll is 6, the second roll will be 1 or 2

Proobability = 2/6^2 = 2/36 = 1/18