instruction:
In this task, you need to provide the correct option for a given problem on probability from the provided options.
question:
Problem: a certain junior class has 1000 students and a certain senior class has 600 students . among these students , there are 60 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 will be a sibling pair ? 
Options: a ) 3 / 40000 , b ) 1 / 1000 , c ) 9 / 2000 , d ) 1 / 60 , e ) 1 / 15
answer:
b


question:
Problem: a fair coin is tossed 5 times . what is the probability of getting more heads than tails in 5 tosses ? 
Options: a ) 1 / 2 , b ) 63 / 128 , c ) 4 / 7 , d ) 61 / 256 , e ) 63 / 64
answer:
a


question:
Problem: what is the probability of getting a sum 9 from two throw of a dice ? 
Options: a ) 1 / 6 , b ) 1 / 8 , c ) 1 / 9 , d ) 1 / 12 , e ) 1 / 13
answer:

c