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A binary operation * is defined on the set X = {1, 2, 3, 4,...

Mathematics
JAMB 2025

A binary operation * is defined on the set X = {1, 2, 3, 4, 5, 6} as a*b = ab + a + b. Compute 1 * 3 

  • A. 14
  • B. 4
  • C. 7
  • D. 5
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Correct Answer: Option C
Explanation

To compute 1 * 3 using the given binary operation * where a * b = ab + a + b:

Substitute a = 1 and b = 3 into the formula:  
1 * 3 = (1)(3) + 1 + 3 = 3 + 1 + 3 = 7.

Thus, 1 * 3 = 7.

There is an explanation video available below.


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Explanation Video

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