instruction:
In this task, you need to provide the correct option for a given problem on probability from the provided options.
question:
Problem: there are 11 boys and 10 girls in a class . if three students are selected at random , in how many ways that 3 girl & 2 boys are selected ? 
Options: a ) 6600 , b ) 1300 , c ) 6780 , d ) 1976 , e ) 2448
answer:
a


question:
Problem: three unbiased coins are tossed . what is the probability of getting 3 heads and 1 tail ? 
Options: a ) 3 / 4 , b ) 1 / 4 , c ) 3 / 8 , d ) 1 / 2 , e ) 1 / 8
answer:
d


question:
Problem: there are 5 pairs of socks and 2 socks are worn from that such that the pair of socks worn are not of the same pair . what is the number of pair that can be formed . 
Options: a ) 19 , b ) 20 , c ) 30 , d ) 32 , e ) 25
answer:

b