यदि * एक बाइनरी संक्रिया है, जिसे \(\rm a*b=\frac{ab}{2}\) रूप में परिभाषित किया गया है, तो इस बाइनरी संक्रिया के संबंध में तत्समक अवयव है?

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दिया गया है:

\(\rm *\) एक बाइनरी संक्रिया है, जिसे \(\rm a*b=\frac{ab}{2}\) को रूप में परिभाषित किया जाता है। 

अवधारणा:

तत्समक अवयव के गुणधर्म का प्रयोग कीजिए।  

यदि e तत्समक है, तो -

\(\rm e*a=a*e=a\)

गणना:

मान लीजिए \(\rm e\) तत्समक है,

\(\rm a*e=\frac{ae}{2}\)

\(\rm \implies a=\frac{ae}{2}\)

\(\rm \implies e=a\cdot\frac{2}{a}\)

\(\rm \implies e=2\)

अतः विकल्प (2) सही है।

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