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?
@SolomonZelman

Question

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?
@SolomonZelman

solomonzelman · Answer

Same question would be

What's the probability that the sum of one roll is less than 3?

see why it's the same question?

anonymous · Answer

would it be 1/3? @SolomonZelman

solomonzelman · Answer

Why do you think it's 1/3 ?

anonymous · Answer

because one roll 3/1

solomonzelman · Answer

Hold on, I am being confused overhere, sorry.

OVERALL tom rolls 4 times.

we know that the first 2 times add up to 6.

Am I correct?

anonymous · Answer

no he rolls two times only

solomonzelman · Answer

oh, and the first roll is 6, and the second has to be less the  3, then you are correct!

solomonzelman · Answer

1,2,3,4,5,6

6 numbers (ALL)     2 number (Less then 3)
2/6=1/3