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सिद्ध कीजिए कि  f(x)= 2x द्वारा प्रदत्त ...

सिद्ध कीजिए कि  `f(x)= 2x` द्वारा प्रदत्त फलन `f : N to N`, एकेको है किंतु आच्छादक नही है।

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