If b, c are like unit vectors and a×b×c=0 then

|b|=|c|=1 ⇒ b, c are parallel vectors a·b=a·c

|b|=|c|=1 ⇒ b, c are parallel vectors a·b=a·c

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If $b, c$ are like unit vectors and $a \times (b \times c) = 0$ then

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$b \cdot c \neq c \cdot a$

$a \cdot b \neq a \cdot c$

$a \cdot c = b \cdot c$

$a \cdot b = a \cdot c$

answer is B.

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$| b | = | c | = 1 \Rightarrow b, c$ are parallel vectors $a \cdot b = a \cdot c$

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