In this task, you need to provide the correct option for a given problem on probability from the provided options.

[EX Q]: Problem: wink , inc . follows a certain procedure that requires two tasks to be finished independently in order for a job to be done . on any given day , there is a 2 / 3 probability that task 1 will be completed on time , and a 3 / 5 probability that task 2 will be completed on time . on a certain day , what is the probability that task 1 will be completed on time , but task 2 will not ?
Options: a ) 4 / 15 , b ) 3 / 40 , c ) 13 / 40 , d ) 7 / 20 , e ) 13 / 22
[EX A]: a

[EX Q]: Problem: how many cubes of 5 cm edge can be cut out of a cube of 15 cm edge
Options: a ) 36 , b ) 232 , c ) 27 , d ) 48 , e ) none of these
[EX A]: c

[EX Q]: Problem: a bag contains 3 blue and 5 white marbles . one by one , marbles are drawn out randomly until only two are left in the bag . what is the probability z that out of the two , one is white and one is blue ?
Options: a ) 15 / 56 , b ) 41 / 56 , c ) 13 / 28 , d ) 15 / 28 , e ) 5 / 14
[EX A]:
d