Mathematics > 2007 > 23
JAMB UTME
A binary operation Δ is defined by aΔb = a + b + 1 for any real 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
Answer: B
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