Jamb Mathematics 2012 Past Questions and Answers

Question 21:

• JAMB 2012

The binary operation on the set of real numbers is defined by m*n = \(\frac{mn}{2}\) for all m, n \(\in\) R. If the identity element is 2, find the inverse of -5

A. \(-\frac{4}{5}\)
B. \(-\frac{2}{5}\)
C. 4
D. 5

Question 22:

• JAMB 2012

If \(\begin{vmatrix} 5 & 3 \\ x & 2 \end{vmatrix}\) = \(\begin{vmatrix} 3 & 5 \\ 4 & 5 \end{vmatrix}\), find the value of x

A. 3
B. 4
C. 5
D. 7

Question 23:

• JAMB 2012

Given that I₃ is a unit matrix of order 3, find |I₃|

A. -1
B. O
C. 1
D. 2

Question 24:

• JAMB 2012

The angles of a polygon are given by x, 2x, 3x, 4x and 5x respectively. Find the value of x.

A. 24^o
B. 30^o
C. 33^o
D. 36^o

Question 25:

• JAMB 2012

Calculate the volume of a cuboid of length 0.76cm, breadth 2.6cm and height 0.82cm.

A. 3.92cm³
B. 2.13cm³
C. 1.97cm³
D. 1.62cm³