Two right circular cones have their heights in the ratio 1 : 3 and radii in the ratio 3 : 1, what is the ratio of their volumes?

The probability that it will rain tomorrow is 0.85. What is the probability that it will not rain tomorrow?

What is the arithmetic mean of first n natural numbers?

Using the empirical formula, find the mode of a distribution whose mean is 8.32 and the median is 8.05.

Evaluate (sec A + tan A)⋅(1 – sin A) for A = 60°.