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If three vetors veca,vecb" and "vecc of ...

If three vetors `veca,vecb" and "vecc` of magnitudes 3,4 and 5 respectively are such that each vectors is perpendicular to the sum of the orher two vectors, then prove that `|veca+vecb+vecc|=5sqrt(2)`.

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CHHAYA PUBLICATION-QUESTION PAPER -2018-WBJEE
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  19. If |{:(-1,7,0),(2,1,-3),(3,4,1):}|=A" then"|{:(13,-11,5),(-7,-1,25),(-...

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