A spherical balloon of radius r subtends angle 60° at the eye of an observer. If the angle of elevation of its centre is 60° and h is the height of the centre of the balloon, then which one of the following is correct?

Which one of the following methods can be used to separate anthracene from a mixture…

If A and B are two events such that P(A) = 3/4 and P(B) =…

If the mode of the scores 10, 12, 13, 15, 15, 13, 12, 10, x…

In a binomial distribution, the mean is 2 and variance is 5/9. What is the…

A coin is tossed twice. If E and F denote occurrence of head on first…