Binary Operations - Jamb Mathematics Past Questions and Answers

Question 41:

• JAMB 2010

If p and q are two non zero numbers and 18(p+q) = (18+p)q, which of the following must be true?

A. Q = 18
B. P
C. P = 18
D. Q < 1

Question 42:

• JAMB 2011

A binary operation \(\oplus\) om real numbers is defined by x \(\oplus\) y = xy + x + y for two real numbers x and y. Find the value of 3 \(\oplus\) - \(\frac{2}{3}\).

A. - \(\frac{1}{2}\)
B. \(\frac{1}{3}\)
C. -1
D. 2

Question 43:

• JAMB 2012

The binary operation * is defined on the set of integers such that p * q = pq + p - q. Find 2 * (3 * 4)

A. 11
B. 13
C. 15
D. 22

Question 44:

• 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 45:

• 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