16.The ratio of the length of a vertical rod and the length of its shadow is 1:√3. Find the angle of elevation of the sun at that moment.
17.Two cones have their heights in the ratio 1:3 and radii in the ratio 3:1. What is the ratio of their volumes?
18. A letter of English alphabet is chosen at random. What is the probability that the chosen letter is a consonant.
19. A die is thrown once. What is the probability of getting a number less than 3?
OR
If the probability of winning a game is 0.07, what is the probability of losing it?
20. If the mean of the first n natural number is 15, then find n.