WAEC Further Mathematics 2011 Question 31

Question 31

Probability

A basket contains 3 red and 1 white identical balls. A ball is drawn from the basket at random. Calculate the probability that it is either white or red.

A.⅓
B.½
C.¾
D.1

Show the answer and explanation

Answer: D (1)

Explanation

Every ball is either white or red, so the probability is 1/4 + 3/4 = 1.