Out of 7 consonants and 4 vowels, how many words of 3 consonants and 2 vowels can be formed?

From a point P, Q is 5km due West and R is12km due South of Q. Find the distance between P and R.

if y = 23\(_{five}\) + 101\(_{three}\) find y leaving your answer in base two

A box contains two red balls and four blue balls. A ball is drawn at random from the box and then replaced before a second ball is drawn. Find the probability of drawing two red balls.

Which one of the following gives the members of the set A1 n B n C?