The differential equation obtained by eliminating the arbitrary constants a and b from xy = aex + be- x is
The number of ways of arranging 8 men and 4 women around a circular table such that no two women can sit together is
8!
4!
8!4!
If cos(A - B) = 3/5 and tan(A)tan(B) = 2, then which one of the following is true ?
D.
If a, b, c are in AP, b - a, c - b and a are in GP, then a: b : c is
1 : 2 : 3
1 : 3 : 5
2 : 3 : 4
1 : 2 : 4
The angle of elevation of an object from a point P on the level ground is . Moving d metres on the ground towards the object, the angle of elevation is found to be . Then the height (in metres) of the object is