Which of the following is true?
A.  Sum of four consecutive even numbers is always divisible by 8. 
B.  Sum of four consecutive odd numbers is always divisible by 8. 
C.  Product of any n consecutive natural numbers may not be divisible by n!. 
D.  Product of 4 consecutive odd numbers is always divisible by 15. 
Option: B Explanation :
(A) Four consecutive even numbers can be written as 2n, 2n + 2, 2n + 4 and 2n + 6,where n is any natural number. Click on Discuss to view users comments. 
Sum of an infinite geometric series is 3 and sum of an infinite geometric series formed from squares of the terms of the original series is 6. First term of the first series will be
A.  
B.  
C.  
D.  

Sum of all odd numbers up to 100 is
A.  5050 
B.  2500 
C.  2525 
D.  5000 
Option: B Explanation :
Given numbers are 1, 3, 5.....99. Click on Discuss to view users comments. 
If x+y+z=0,then x2/yx + y2/zx + z2/xy equal
A.  0 
B.  1 
C.  2 
D.  3 
Option: D Explanation :
x^{2}/yx + y^{2}/zx + z^{2}/xy Click on Discuss to view users comments. Devanshu said: (4:20am on Friday 1st July 2016)
Let x=2 y =1 z=1 then x y z=0 but RHS is  3?????Btw if x y z = 0 then x^3 y^3 z^3=3xyz???? I think it should be  3xyz then ans satisfied

Average age of a committee of seven trustees is the same as it was five years ago, a younger man having been substituted for one of them. How much younger was he then trustee whose place he took?
A.  32 years 
B.  35 years 
C.  33 years 
D.  34 years 
Option: B Explanation :
Increase after 5 years should have been 7 x 5 = 35 years. Click on Discuss to view users comments. 