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If a = 3, b = 4, c = 5 each one of veca,...

If a = 3, b = 4, c = 5 each one of `veca, vecb` & `vecc` is perpendicular to the sum of the remaining then `|veca + vecb + vecc|` is equal to

A

`5/sqrt2`

B

`2/sqrt5`

C

`5sqrt2`

D

`sqrt5`

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The correct Answer is:
C
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