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If bar(a),bar(b) and bar( c ) are three vectors such that bar(a)+bar(b)+bar( c )=bar(0) and |bar(a)|=2,|bar(b)|=3 and |bar( c )|=5, then the value of bar(a).bar(b)+bar(b).bar( c )+bar( c ).bar(a) is ……….. |
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