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मान लीजिए vec(a), vec(b) तीन vec(c ) स...

मान लीजिए `vec(a), vec(b)` तीन `vec(c )` सदिश इस प्रकार हैं कि `|vec(a)| = 3, |vec(b)| = 4, |vec(c )| = 5` और इनमें से प्रत्येक , अन्य दो सदिषन के योगफल पर लंबवत्त है, तो `|vec(a) + vec(b) + vec(c )|` ज्ञात कीजिए |

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