If a⃗, b⃗ and c⃗ are three mutually orthogonal unit vectors, then the triple product [a⃗+b⃗+c⃗a⃗+...

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If a⃗, b⃗ and c⃗ are three mutually orthogonal unit vectors, then the triple product [a⃗+b⃗+c⃗a⃗+b⃗b⃗+c⃗] equals
(1) 0
(2) 1 or -1
(3) 1

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