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: the unit digit in the product ( 891 * 781 * 912 * 463 ) is : 
Options: a ) 2 , b ) 5 , c ) 6 , d ) 8 , e ) 10
c

Problem: 5 % people of a village in sri lanka died by bombardment , 15 % of the remainder left the village on account of fear . if now the population is reduced to 3294 , how much was it in the beginning ? 
Options: a ) 2988 , b ) 2776 , c ) 4079 , d ) 2871 , e ) 881
c

Problem: what is the sum of all the odd numbers between 24 and 50 , inclusive ? 
Options: a ) 592 , b ) 481 , c ) 330 , d ) 475 , e ) 483

b