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Question

If ¯¯¯a=2ˆiˆj+ˆk and ¯¯b=ˆi+ˆj+3ˆk, find ¯¯¯aׯ¯b

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Solution

We have
a=2ˆiˆj+ˆk
b=ˆi+ˆj+3ˆk
Now,
a×b=∣ ∣ ∣ˆiˆjˆz211113∣ ∣ ∣ [by using determinants methods ]
=ˆi(4)ˆj(5)+ˆk(3)
=4ˆi5ˆj+3ˆk
Which is the required answer.

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