ALGEBRA - Jamb Mathematics Past Questions and Answers

Question 311:

• JAMB 1994

Find the range of values of x for which \(\frac{1}{x}\) > 2 is true

A. X < \(\frac{1}{2}\)
B. X < 0 or x < \(\frac{1}{2}\)
C. 0 < x < \(\frac{1}{2}\)
D. 1 < x < 2

Question 312:

• JAMB 1994

If the 6th term of an arithmetic progression is 11 and the first term is 1, find the common difference.

A. \(\frac{12}{5}\)
B. \(\frac{5}{3}\)
C. -2
D. 2

Question 313:

• JAMB 1994

Find the nth term of the sequence 3, 6, 10, 15, 21.....

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

Question 314:

• JAMB 1994

A binary operation \(\oplus\) is defines on the set of all positive integers by a \(\oplus\) b = ab for all positive integers a, b. Which of the following properties does NOT hold?

A. Closure
B. Identity
C. Positive
D. Inverse

Question 315:

• JAMB 1994

\(\begin{array}{c|c} \oplus mod 10 & 2 & 4 & 6 & 8 \\ \hline 2 & 4 & 8 & 2 & 6 \\4 & 8 & 6 & 4 & 2\\ 4 & 8 & 6 & 4 & 2\\ 6 & 2 & 4 & 6 & 8\\ 8 & 6 & 2 & 8 & 4\end{array}\)
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