51). Find the sum of first 37 odd numbers.
A). 1369 
B). 1295 
C). 1388 
D). 1875 

52). Find the sum of first 84 even numbers.
A). 7140 
B). 7540 
C). 6720 
D). 8832 

53). Sum of first 15 multiples of 8 is
A). 960 
B). 660 
C). 1200 
D). 1060 

54). The poduct of four consecutive natural numbers plus one is
A). a nonsquare 
B). always sum of two square numbers 
C). a square 
D). None of the above 

55). Find the unit digit in the product of (268 x 539 x 826 x 102).

56). Find the unit digit in the product of (4326 x 5321).

57). Find the last twodigits of 15 x 37 x 63 x 51 x 97 x 17
A). 35 
B). 45 
C). 55 
D). 85 

58). How many rational numbers are there between 1 and 1000?
A). 998 
B). 999 
C). 1000 
D). Infinite 

59). The sum of 5 consecutive even numbers A,B,C,D and E is 130. What is the product of A and E ?
A). 720 
B). 616 
C). 660 
D). 672 

60). The sum of the five consecutive numbers is equal to 170. What is the product of largest and the smallest numbers?
A). 1512 
B). 1102 
C). 1152 
D). 1210 
