Which of the following is a quadratic eq...

Which of the following is a quadratic equation? a)`x+1/x=-2` b)`m=5n` c)`y^3=9` d)None of these

A

g and f should be injective and surjective

B

g should be injective and surjective

C

f should be injective and surjective

D

None of them may be surjective and injective

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The correct Answer is:

A

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