Which of the following sets is infinite?

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Question

(C) set is called infinite if it contains an unlimited number of elements.$(a)$ The set of prime numbers that are even contains only one element,{$2$}

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Set of all concentric circles

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(C) set is called infinite if it contains an unlimited number of elements.$(a)$ The set of prime numbers that are even contains only one element,{$2$}. This is a finite set.$(b)$ The set of all rivers in India is a finite set because the number of rivers is countable.$(c)$ The set of all concentric circles is infinite because we can draw an infinite number of circles with the same center and different radii.Therefore,option $(c)$ is the correct answer.

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$(iii)$ ${x : x \text{ is an even integer}}$ and ${x : x \text{ is an odd integer}}$