A binary operation Δ is defined by aΔb = a + b + 1 for
MATHEMATICS
JAMB 2007
A binary operation Δ is defined by aΔb = a + b + 1 for any numbers a and b. Find the inverse of the real number 7 under the operation Δ, if the identity element is -1
- A. -7
- B. -9
- C. 5
- D. 9
Correct Answer: B. -9
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