Mathematics 1990 Jamb Past Questions and Answers

Question 26 :

• JAMB 1990

Find the sum of the first 18 terms of the progression 3, 6, 12......

A. 3(2¹⁷ - 1)
B. 3(2¹⁸ - 1)
C. 3(2¹⁸ + 1)
D. 3(2¹⁷ - 1)

Question 27 :

• JAMB 1990

At what value of x is the function x\(^2\) + x + 1 minimum?

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

Question 28 :

• JAMB 1990

The angle of a sector of s circle, radius 10.5cm, is 48 ^o, Calculate the perimeter of the sector

A. 8.8cm
B. 25.4cm
C. 25.6cm
D. 28.8cm

Question 29 :

• JAMB 1990

Find the length of a side of a rhombus whose diagonals are 6cm and 8cm

A. 8cm
B. 5cm
C. 4cm
D. 3cm

Question 30 :

• JAMB 1990

Each of the interior angles of a regular polygon is 140^o. How many sides has the polygon?

A. 9
B. 8
C. 7
D. 5