In this task, you need to answer the given multiple-choice question on the general math. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

[EX Q]: Problem: how many positive integers less than 100 have a remainder of 6 when divided by 13 ? 
Options: a ) 2 , b ) 7 , c ) 6 , d ) 9 , e ) 10
[EX A]: c

[EX Q]: Problem: what should be the least number to be added to the 3198 number to make it divisible by 8 ? 
Options: a ) 12 , b ) 17 , c ) 2 , d ) 77 , e ) 26
[EX A]: c

[EX Q]: Problem: an exam consists of 7 true / false questions . brian forgets to study , so he must guess blindly on each question . if any score above 70 % is a passing grade , what is the probability that brian passes ? 
Options: a ) 1 / 16 , b ) 37 / 256 , c ) 1 / 2 , d ) 219 / 256 , e ) 15 / 16
[EX A]:
d