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

[EX Q]: Problem: an urn contains 10 black and 5 white balls . two balls are drawn from the urn one after the other without replacement . what is the probability that both drawn balls are black ? 
Options: a ) 1 / 5 , b ) 3 / 7 , c ) 2 / 5 , d ) 3 / 5 , e ) 2 / 7
[EX A]: b

[EX Q]: Problem: in a college the ratio of the numbers of boys to the girls is 8 : 5 . if there are 135 girls , the total number of students in the college is ? 
Options: a ) 562 , b ) 351 , c ) 452 , d ) 416 , e ) 512
[EX A]: b

[EX Q]: Problem: how many integers from 1 to 100 ( both inclusive ) have odd number of factors ? 
Options: a ) 7 , b ) 8 , c ) 9 , d ) 10 , e ) greater than 10
[EX A]:
d