Which of the following sets is not conve...

Which of the following sets is not convex?

A

`{(x,y)|2x+5y lt7}`

B

`{(x,y)|x^(2)+y^(2) le 4}`

C

`{x:|x|=5}`

D

`{(x,y)|3x^(2)+2y^(2) le 6}`

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The correct Answer is:

C

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