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MATHEMATICS

JAMB 2006 - Question 37

Mathematics 2006 JAMB Past Questions - Question 37: A binary operation * defined on the set of real numbers is such that x*y=xy/6 for all x,yER .Find the inverse of 20 under this operation when the identity element is 6.

Choose the most appropriate option for the gap .

A binary operation * defined on the set of real numbers is such that x*y=xy/6 for all x,yER .Find the inverse of 20 under this operation when the identity element is 6.

A: 1/12

B: 10/3

C: 1/20

D: 9/5

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Correct Answer

Explanation

1/20 x 6 =6 x 1 = 1 6 20 6 20