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'.

Problem: what is the least number which should be added to 5432 so that the sum is exactly divisible by 5 , 6 , 4 , and 3 ?
Options: a ) 16 , b ) 22 , c ) 28 , d ) 34 , e ) 40
c

Problem: 1257 1275 1527 . . . . . . . . . . . . . . . . + 7521 the addition problem above shows 4 of the 24 different integers that can be formed by using each of the digits 1 , 25 and 7 exactly once in each integer . what is the sum t of the 24 integers ?
Options: a ) 26996 , b ) 44406 , c ) 60444 , d ) 66660 , e ) 99990
e

Problem: if equation | x / 2 | + | y / 2 | = 1 encloses a certain region on the coordinate plane , what is the area of this region ?
Options: a ) 8 , b ) 50 , c ) 100 , d ) 200 , e ) 400
a