Probability - Jamb Mathematics Past Questions and Answers

Question 26:

• JAMB 1985

A bag contains 4 white balls and 6 red balls. Two balls are taken from the bag without replacement. What is the probability that they are both red?

A. \(\frac{2}{3}\)
B. \(\frac{2}{15}\)
C. \(\frac{1}{2}\)
D. \(\frac{1}{3}\)

Question 27:

• JAMB 1986

Find the probability that a number selected at random from 40 to 50 is a prime

A. \(\frac{3}{11}\)
B. \(\frac{5}{11}\)
C. \(\frac{3}{11}\)
D. \(\frac{4}{11}\)

Question 28:

• JAMB 1986

A man kept 6 black, 5 brown and 7 purple shirts in a drawer. What is the probability of his picking a purple shirt with his eyes closed?

A. \(\frac{1}{7}\)
B. \(\frac{11}{18}\)
C. \(\frac{7}{18}\)
D. \(\frac{7}{11}\)

Question 29:

• JAMB 1988

A basket contain green, black and blue balls in the ratio 5 : 2 : 1. If there are 10 blue balls. Find the corresponding new ratio when 10 green and 10 black balls are removed from the basket

A. 1 : 1 : 1
B. 4 : 2 : 1
C. 5 : 1 : 1
D. 4 : 1 : 1

Question 30:

• JAMB 1988

If two dice are thrown together, what is the probability of obtaining at least a score of 10?

A. \(\frac{1}{6}\)
B. \(\frac{1}{12}\)
C. \(\frac{5}{6}\)
D. \(\frac{11}{12}\)