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A binary operation \(\otimes\) is defined by \(m \otimes n = mn + m - n\)...

Mathematics
JAMB 2019

A binary operation \(\otimes\) is defined by \(m \otimes n = mn + m - n\) on the set of real numbers, for all m, n \(\in\) R. Find the value of 3 \(\otimes\) (2 \(\otimes\) 4).

  • A. 6
  • B. 25
  • C. 15
  • D. 18
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Correct Answer: Option C
Explanation

\(m \otimes n = mn + m - n\)

3 \(\otimes\) (2 \(\otimes\) 4)

2 \(\otimes\) 4 = 2(4) + 2 - 4 = 6

3 \(otimes\) 6 = 3(6) + 3 - 6  = 15

There is an explanation video available below.


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Explanation Video

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WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free