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

[Q]: Problem: a jar contains 20 red , 20 blue , 6 yellow and 4 pink balls . if two balls are to be selected at random and without replacement , approximately what is the probability both of them to be the same colour ? 
Options: a ) 1 / 25 , b ) 1 / 15 , c ) 1 / 3 , d ) 1 / 2 , e ) 1
[A]: c


[Q]: Problem: what is the square root of 261,121 ? 
Options: a ) 476 , b ) 489 , c ) 497 , d ) 511 , e ) 524
[A]: d


[Q]: Problem: at a kennel with 80 dogs , 45 of the dogs wear tags and 40 wear flea collars . if 6 of the dogs wear both , then how many of the dogs wear neither a collar nor tags ? 
Options: a ) 1 , b ) 6 , c ) 34 , d ) 79 , e ) 85
[A]:
a