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Question

Value of scalar triple product is zero if any 2 vectors are identical.

A
True
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B
False
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Solution

The correct option is A True
If we have 3 vectors, a,b,c, then their scalar triple product is given by [a,b,c]=(a×b).c
If a=b
then (a×b).c=(a×a).c
now (a×a)=0 (cross product of 2 identical vectors is zero as angle between them is zero)
So [a,b,c]=0

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