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सिद्ध किजिए कि f(1) = f(2) = 1 तथा x gt...

सिद्ध किजिए कि `f(1) = f(2) = 1` तथा `x gt 2` के लिए `f(x) = x-1` द्वारा प्रदत्त फलन ` f: N to N `, आच्छादक तो है किंतु एकैको नहीं है।

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