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यदि | bar(a) | = 2 , | bar(b)| = 5 तथा ...

यदि `| bar(a) | = 2 , | bar(b)| = 5` तथा `| bar(a) xx bar(b)|= 8 ` हो , तो `bar(a) . bar(b)` का मान ज्ञात कीजिए।

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