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. | |
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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 :
x2/yx + y2/zx + z2/xy Click on Discuss to view users comments. Devanshu said: (1:20am 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
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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. |