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If →a,→b and →c are unit vectors satisfying |→a−→b|2+|→b−→c|2+|→c−→a|2=9, then |2→a+5→b+5→c| is

Answer» If a,b and c are unit vectors satisfying |ab|2+|bc|2+|ca|2=9, then |2a+5b+5c| is


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