Waec Mathematics Past Questions
Question 1641
A trader makes a loss of 15% when selling an article. Find the ratio, selling price : cost price
- A. 3:20
- B. 3:17
- C. 17:20
- D. 20:23
Question 1642
Evaluate \(3.0\times 10^1 - 2.8\times 10^{-1}\)leaving the answer in standard form
- A. \(2\times 10^{-1}\)
- B. \(2\times 10^{2}\)
- C. \(2.972 \times 10^{1}\)
- D. \(2.972 \times 10^{2}\)
Question 1643
It is observed that \(1 + 3 = 2^2, 1 + 3 + 5 = 3^2, 1 + 3 + 5 + 7 = 4^2. \\If \hspace{1mm}1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 = P^2 find\hspace{1mm}P\)
- A. 6
- B. 7
- C. 8
- D. 9
Question 1644
If P = {3, 7, 11, 13} and Q = {2, 4, 8, 16}, which of the following is correct
- A. \((P\cap Q)^l={2, 3, 4, 13}\)
- B. \(n(P\cup Q)=4\)
- C. \(P\cup Q = \emptyset\)
- D. \(P\cap Q = \emptyset\)
Question 1645
From a set \(A = [3, \sqrt{2}, 2\sqrt{3}, \sqrt{9}, \sqrt{7}]\), a number is selected at random. Find the probability that is a rational number
- A. \(\frac{1}{5}\)
- B. \(\frac{2}{5}\)
- C. \(\frac{3}{5}\)
- D. \(\frac{4}{5}\)
