Question

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

Answer 1

to make the sum < 8 you must roll a 1, 2 or 3 on the second roll

Answer 2

1/3? :3

Answer 3

i'm thinking it would be 1/6 since he rolled it twice but he already rolled a 4

Answer 4

no
there are 6 possible results on second throw and you want any 1 of 3 so
probability is 3/6

Answer 5

3/6 = 1/2