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Saturday, 15 August 2026
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Mathematics Past Questions and Answers

Topic: Binary Operations

Jamb Mathematics Questions - Binary Operations

Question 6:
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
View Answer & Explanation
Question 7:
The identity element with respect to the multiplication shown in the diagram below is \(\begin{array}{c|c} \otimes & p & p & r & s \\ \hline p & r & p & r & p
\\ q & p & q & r & s\\ r & r & r & r & r\\ s & q & s & r & q\end{array}\)
  • A P
  • B Q
  • C R
  • D S
View Answer & Explanation
Question 8:
The binary operation \(\oplus\) is defined by x \(\ast\) y = xy - y - x for all real values x and y. If x \(\ast\) 3 = 2\(\ast\), find x
  • A -1
  • B 4
  • C 1
  • D 5
View Answer & Explanation
Question 9:
A binary operation * is defined by a*b = ab+a+b for any real number a and b. if the identity element is zero, find the inverse of 2 under this operation.
  • A 2/3
  • B 1/2
  • C -1/2
  • D -2/3
View Answer & Explanation
Question 10:
A binary operation * is defined by a * b = a\(^b\). If a * 2 = 2 - a, find the possible values of a.
  • A 1, -1
  • B 1, 2
  • C 2, -2
  • D 1, -2
View Answer & Explanation