Jamb Mathematics Past Questions For Year 1994
Question 21
\(\begin{array}{c|c} \oplus mod 10 & 2 & 4 & 6 & 8 \\ \hline 2 & 4 & 8 & 2 & 6 \\4 & 8 & 6 & 4 & 2\\ 4 & 8 & 6 & 4 & 2\\ 6 & 2 & 4 & 6 & 8\\ 8 & 6 & 2 & 8 & 4\end{array}\)
The multiplication table above has modulo 10 on the set S = (2, 4, 6, 8). Find the inverse of 2
- A. 2
- B. 4
- C. 6
- D. 8
Question 22
Solve for x and y \(\begin{pmatrix} 1 & 1 \\ 3 & y \end{pmatrix}\)\(\begin{pmatrix} x \\ 1 \end{pmatrix}\) = \(\begin{pmatrix} 4 \\ 1\end{pmatrix}\)
- A. x = 3, y = 8
- B. x = 3, y = -8
- C. x = -8, y = 3
- D. x = 8, y = -3
Question 23
The determination of the matrix \(\begin{pmatrix} 1 & 3 & 3 \\ 4 & 5 & 6\\ 2 & 0 & 1 \end{pmatrix}\) is
- A. -67
- B. -57
- C. -3
- D. 3
Question 24
\(\begin{array}{c|c} \text{Age in years} & 10 & 11 & 12 \\ \hline \text{Number of pupils} & 6 & 27 & 7\end{array}\)
The table above shows the number of pupils in each age group in a class. What is the probability that a pupil chosen at random is at least 11 years old?
- A. \(\frac{27}{40}\)
- B. \(\frac{17}{20}\)
- C. \(\frac{33}{40}\)
- D. \(\frac{3}{20}\)
Question 25
If three angles of a quadrilateral are (3y -x - z)°, 3x°, (2z - 2y - x)°, find the fourth angle in terms of x, y and z
- A. (360 - x- y - z)°
- B. (360 + x + y - z)°
- C. (180 - x + y + z)°
- D. (180 - x + y + z)°
