Mathematics Past Questions and Answers

A bag contains 4 blue and 8 red identical balls. If two balls are picked at random with replacement, what is the probability of picking two balls of different colours?

A 1
B \(\frac{13}{26}\)
C \(\frac{5}{18}\)
D \(\frac{4}{9}\)
E \(\frac{2}{9}\)

Question 127:

A car dealer sells a car and makes a profit of 15%. If the car costs N320,000.00, how much did he sell the car?

A N272,000.00
B N296,000.00
C N300,000.00
D N368,000.00
E N400,000.00

Question 128:

If A(I,2,3,...,10) ; B = (-5,-4,.....,-1) ; C = (-1, 0, 1, 2,....5) List all the elements in (B ∪ C) ∩ A

A (-1,2,...5)
B (-1,1,....5)
C (1,2,..5)
D (2,3,...10)
E (1,2,...10)

Question 129:

What is the positive difference between the squares of 2.5 and 2.1 to 1 significant figures?

A – 2.0
B – 184
C -1.84
D 2
E 18.4

Question 130:

Find the value of 2a - b if a + b = 8 and 4a - b = 22

A 2
B 4
C 6
D 8
E 10