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

Q: Problem: a fair coin is tossed 9 times . what is the probability of getting more heads than tails in 9 tosses ? 
Options: a ) 1 / 2 , b ) 63 / 128 , c ) 4 / 7 , d ) 61 / 256 , e ) 63 / 64

A: a
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Q: Problem: two cards are drawn together from a pack of 52 cards . the probability that one is a spade and one is a heart , is : 
Options: a ) 2 / 109 , b ) 7 / 109 , c ) 8 / 223 , d ) 14 / 263 , e ) 13 / 102

A: e
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Q: Problem: given a bag with 2 red balls and 3 yellow balls , you randomly select one of them , in order . if the second ball you take is yellow , what is the probability that the first one was also yellow ? 
Options: a ) 1 / 2 , b ) 1 / 5 , c ) 3 / 4 , d ) 1 / 3 , e ) 3 / 5

A:
a
****