In this task, you need to provide the correct option for a given problem on probability from the provided options.
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Question: Problem: a jar contains 3 black , 3 white and 1 green balls . if you pick two balls at the same time , what ' s the probability that one ball is black and one is white ? 
Options: a ) 2 / 7 , b ) 5 / 7 , c ) 4 / 7 , d ) 3 / 7 , e ) 1 / 2

Answer: d


Question: Problem: from a group of 5 boys and 5 girls , 6 children are to be randomly selected . what is the probability that 3 boys and 3 girls will be selected ? 
Options: a ) 4 / 15 , b ) 6 / 17 , c ) 8 / 19 , d ) 10 / 21 , e ) 12 / 23

Answer: d


Question: Problem: three unbiased coins are tossed . what is the probability of getting at least 2 tails ? 
Options: a ) 0.75 , b ) 0.5 , c ) 0.25 , d ) 0.2 , e ) 0.3

Answer:
b