Word Count : 227

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सहजता से हल करते हैं। परिभाषित ऑपरेशन: [ a \langle b = \frac{a + b}{2}, \quad \forall a,b \in \mathbb{R}. ] (1) क्या (\langle) सहयोगी (associative) है? सहयोगी होने के लिए चाहिए कि: [ (a \langle b) \langle c = a \langle (b \langle c), _____ ______ ________ __________ ___ _______ __________.
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