instruction:
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'.
question:
Problem: the difference between a 7 digit number and the number formed by reversing its digit is not a multiple of
Options: a ) 121 , b ) 11 , c ) 9 , d ) 10 , e ) 3
answer:
a

question:
Problem: a ' s speed is 20 / 19 times that of b . if a and b run a race , what part of the length of the race should a give b as a head start , so that the race ends in a dead heat ?
Options: a ) 1 / 19 , b ) 3 / 19 , c ) 1 / 10 , d ) 1 / 20 , e ) 3 / 10
answer:
d

question:
Problem: how many positive integers less than 5,000 are evenly divisible by neither 13 nor 21 ?
Options: a ) 4,514 , b ) 4,475 , c ) 4,521 , d ) 4,428 , e ) 4,349
answer:
e