bbyitskeke83391 bbyitskeke83391

08-05-2024
Mathematics

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If the moduli of the vectors a, b, c are 3, 4, 5 respectively and a and b + c, b and c + a, c and a + b are mutually perpendicular, then the modulus of a + b + c is
A. √12
B. 12
C. 5√2
D. 50

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