Jamb Mathematics 2013 Past Questions and Answers

Question 16:

• JAMB 2013

If the sum of the first two terms of a G.P. is 3, and the sum of the second and the third terms is -6, find the sum of the first term and the common ratio

A. -2
B. -3
C. -5
D. 5

Question 17:

• JAMB 2013

The n^th term of the progression \(\frac{4}{2}\), \(\frac{7}{3}\), \(\frac{10}{4}\), \(\frac{13}{5}\) is ...

A. \(\frac{1 - 3n}{n + 1}\)
B. \(\frac{3n + 1}{n + 1}\)
C. \(\frac{3n + 1}{n - 1}\)
D. \(\frac{3n - 1}{n + 1}\)

Question 18:

• JAMB 2013

If a binary operation * is defined by x * y = x + 2y, find 2 * (3 * 4)

A. 24
B. 16
C. 14
D. 26

Question 19:

• JAMB 2013

If P = \(\begin{pmatrix} 5 & 3 \\ 2 & 1 \end{pmatrix}\) and Q = \(\begin{pmatrix} 4 & 2 \\ 3 & 5 \end{pmatrix}\), find 2P + Q

A. \(\begin{vmatrix} 7 & 7 \\ 14 & 8 \end{vmatrix}\)
B. \(\begin{vmatrix} 14 & 8 \\ 7 & 7 \end{vmatrix}\)
C. \(\begin{vmatrix} 7 & 7 \\ 8 & 14 \end{vmatrix}\)
D. \(\begin{vmatrix} 8 & 14 \\ 7 & 7 \end{vmatrix}\)

Question 20:

• JAMB 2013

Find the inverse \(\begin{pmatrix} 5 & 3 \\ 6 & 4 \end{pmatrix}\)

A. \(\begin{vmatrix} 2 & -\frac{3}{2} \\ -3 & -\frac{5}{2} \end{vmatrix}\)
B. \(\begin{vmatrix} 2 & -\frac{3}{2} \\ -3 & \frac{5}{2} \end{vmatrix}\)
C. \(\begin{vmatrix} 2 & \frac{3}{2} \\ -3 & \frac{5}{2} \end{vmatrix}\)
D. \(\begin{vmatrix} 2 & \frac{3}{2} \\ -3 & \frac{5}{2} \end{vmatrix}\)