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बतलाइये की निम्नलिखित समुच्चयों में कौन ...

बतलाइये की निम्नलिखित समुच्चयों में कौन परिमित है और कौन अपरिमित है:
(i) `[x:x in N "और" (x-1)(x-2)=0]`
`[x:x in N "और" x^(2)=4]`
(iii) `[x:x in N "और" 2x-1=0]`
(iv) [`x:x in N` और x एक अभाज्य है]
(v) [`x:x in N` और x विषम है]

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