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: the element being searched for is not found in an array of 100 elements . what is the average number of comparisons needed in a sequential search to determine that the element is not there , if the elements are completely unordered ? 
Options: a ) 25 , b ) 50 , c ) 75 , d ) 100 , e ) 125
[EX A]: d

[EX Q]: Problem: what is the least whole number that should be added to 784839 if it is to be divisible by 10 ? 
Options: a ) 3 , b ) 2 , c ) 1 , d ) 5 , e ) 6
[EX A]: c

[EX Q]: Problem: find the largest number of 4 digits which is exactly divisible by 2718 , 1615 
Options: a ) 8600 , b ) 8610 , c ) 8620 , d ) 8630 , e ) 8640
[EX A]:
e