# Mathematics 2021 Past Questions | WAEC

46. A box contains 40 identical balls of which 10 are red and 12 are blue. If a ball is selected at random from the box, what is the probability that it is **neither** red **nor** blue?

- A.9/20
- B. 3/10
- C. 1/4
- D. 11/20

**47. **A fair die is tossed twice. What is the probability of getting at least 10?

- A. 5/36
- B. 2/3
- C. 5/18
- D. 1/6

**48. **A man will be (x + 10) years old in 8 years time. If 2 years ago, he was 63 years, find the value of x

- A. 55
- B. 63
- C. 57
- D.67

**49. **The equation of a line is given as 3x – 5y = 7. Find its gradient (slope).

- A. 5/3
- B. 3/5
- C. -3/5
- D. -5/3

**50. **For what value of x 4-2x/x+1 undefined?

**A.**22**B.**24**C.**36**D.**26

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