Jamb Mathematics Past Questions For Year 1980
Question 16
What factor is common to all the expressions \(x^2- x\), \(2x^2+ x - 1\) and \(x^2- 1\)?
- A. x
- B. x + 1
- C. x - 1
- D. No common factor
- E. (2x - 1)
Question 17
Which of the formula below represents the general terms of the following set of numbers(-1, \(\frac{2}{3}\), -\(\frac{1}{2}\), \(\frac{2}{5}\)......) for n = 1, 2, 3, 4.......?
- A. \(\frac{2}{n + 1}\)
- B. (-1)n + 1 \(\frac{2}{n + 1}\)
- C. (-1)n \(\frac{2}{n + 1}\)
- D. \(\frac{n}{2n - 1}\)
- E. (-1)n\(\frac{n}{2n - 1}\)
Question 18
Three numbers, x, y and z are connected by the relationships y = \(\frac{4x}{9}\) + 1. If x = 99, Find z = \(\frac{4y}{9}\) + 1
- A. 6\(\frac{1}{3}\)
- B. 20
- C. 21
- D. 176\(\frac{4}{9}\)
- E. None of the above
Question 19
In a school, there are 35 students in class 2A and 40 in class 2B. The mean score for class 2 in an English Literature examination is 60.0 and that for 2B in the same paper is 52.5. Find, to one place of decimal, the mean for the combined classes
- A. 2.5
- B. 56.0
- C. 56.2
- D. 56.3
- E. 6.5
Question 20
A set of data contains a total of 130 items which are divided into six groups for display on a pie chart. If one group contains 26 items, then the sector representing this group on the pie chart contains an angle x° at the center of the circle where x is
- A. 36°
- B. 60°
- C. 70°
- D. 72°
- E. 75°
