Mathematics 1989 Jamb Past Questions and Answers

Question 26 :

• JAMB 1989

Simplify \(\frac{x(x + 1)^{\frac{1}{2}} - (x + 1)^{\frac{1}{2}}}{(x + 1)^{\frac{1}{2}}}\)

A. \(\frac{-1}{x + 1}\)
B. \(\frac{1}{x + 1}\)
C. \(\frac{1}{x}\)
D. \(\frac{1}{x - 1}\)

Question 27 :

• JAMB 1989

The sum of the first two terms of a geometric progression is x and sum of the last terms is y. If there are n terms in all, then the common ratio is

A. \(\frac{x}{y}\)
B. \(\frac{y}{x}\)
C. (\(\frac{x}{y}\))^{\(\frac{1}{n - 2}\)}
D. (\(\frac{y}{x}\))^{\(\frac{1}{n - 2}\)}

Question 28 :

• JAMB 1989

If -8, m, n, 19 are in arithmetic progression, find (m, n)

A. 1, 10
B. 2, 10
C. 3, 13
D. 4, 16

Question 29 :

• JAMB 1989

A regular polygon of (2k + 1) sides has 140° as the size of each interior angle. Find k

A. 4
B. 4\(\frac{1}{2}\)
C. 8
D. 8\(\frac{1}{2}\)

Question 30 :

• JAMB 1989

PQRS is a rhombus. If PR\(^2\) + QS\(^2\) = kPQ\(^2\), determine k.

A. 1
B. 2
C. 3
D. 4