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'.

[Q]: 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
[A]: e


[Q]: Problem: 1 , 6 , 16 , 31 , 51 , ( . . . . ) 
Options: a ) 61 , b ) 66 , c ) 76 , d ) 86 , e ) 83
[A]: b


[Q]: Problem: every year an amount increases by 1 / 6 th of itself . how much will it be after two years if its present value is rs . 64000 ? 
Options: a ) 87111 , b ) 81007 , c ) 81008 , d ) 81066 , e ) 81022
[A]:
a