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[" 12.Let "A={x in R:x" is not a positiv...

[" 12.Let "A={x in R:x" is not a positive integer "}],[" Define a function "f:A rarr R" as "f(x)=(2x)/(x-1)],[" then "f" is "],[" (a) surjective but not injective "],[" (b) injective but not surjective "],[" (c) not injective "],[" (d) neither injective nor surjective "]

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