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सकारात्मक परीमेयांच्या संचावर द्विपद क्रिया  * परिभाषित केल्यानंतर

जर 2 * x = 3-1 असेल तर x = 

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Option 2 :

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गणना:

म्हणून, पर्याय (2) योग्य आहे.

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