Some good DS questions i came across...
1. When the positive integer
x is divided by 4, is the remainder equal to 3?
(1) When
x/3 is divided by 2, the remainder is 1.
(2)
x is divisible by 5.
2. In a single row of yellow, green and red colored tiles, every red tile is preceded immediately by a yellow tile and every yellow tile is preceded immediately by a green tile. What color is the 24th tile in the row?
(1) The 18th tile in the row is not yellow.
(2) The 19th tile in the row is not green.
3. If
a and
b are integers, and |
a| > |
b|, is
a · |
b| <
a –
b?
(1)
a < 0
(2)
ab 
0
4. What is the standard deviation of Q, a set of consecutive integers?
(1)Q has 21 members.
(2)The median value of set Q is 20