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The negation of the statement ''for all ...

The negation of the statement ''for all real numbers x and y, `x+y=y+x''` is

A

for some real numbers x and y,
`x-y=y-x`

B

for some real numbers x and y,
`x+yney+x`

C

for some real numbers x and y,
`x+y=y+x`

D

for some real numbers x and y,
`x+y ne y+x`

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