First slide

Vectors

Question

If a + b + c = 0, then a X b is equal to

Moderate

A

b x c
B

c x b
C

a x c
D

None of these

Solution

We have, a + b + c = 0
$∴$ a+ c = $-$ b
or (a+ c) x b = $-$ b x b =0
$\Rightarrow$ (a x b) + (c x b) = 0
Hence, a x b = b x c

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