If x is small, so that x2 and higher powers can be neglected, then the approximate value for
1 - 2x
1 - 3x
1 - 4x
1 - 5x
The equation of the pair of lines passing through the orign whose sum and product of slopes are respectively the arithmetic mean and geometric mean of 4 and 9 is
12x2 - 13xy + 2y2 = 0
12x2 + 13xy + 2y2 = 0
12x2 - 15xy + 2y2 = 0
12x2 + 15xy - 2y2 = 0
The equation represents a pair of straight lines. If is the angle between them, then is equal to
If the roots of x3 - kx2 + 14x - 8 = 0 are in geometric progression, then k is equal to
- 3
7
4
0
The number of four-digit numbers formed by using the digits 0, 2, 4, 5 and which are not divisible by 5, is
10
8
6
4
C.
The greatest positive integer which divides (n + 16)(n + 17)(n + 18)(n +19), for all positive integers n, is
6
24
28
20