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

Q: Problem: a meeting has to be conducted with 5 managers . find the number of ways in which the managers be selected from among 9 managers , if 2 managers will not attend the meeting together ? 
Options: a ) 35 , b ) 91 , c ) 120 , d ) 126 , e ) 150

A: b
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Q: Problem: what is the probability of getting exactly three heads on five flips of a fair coin ? 
Options: a ) 1 / 32 , b ) 3 / 32 , c ) 1 / 4 , d ) 5 / 16 , e ) 1 / 2

A: d
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Q: Problem: a certain junior class has 1,000 students and a certain senior class has 800 students . among these students , there are 20 siblings pairs , each consisting of 1 junior and 1 senior . if 1 student is to be selected at random from each class , what is the probability that the 2 students selected at will be a sibling pair ? 
Options: a ) 3 / 40,000 , b ) 1 / 3,600 , c ) 9 / 2,000 , d ) 1 / 40,000 , e ) 1 / 15

A:
d
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