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veca+vecb=vec c and |veca|=|vecb|=|vec c...

`veca+vecb=vec c` and `|veca|=|vecb|=|vec c|`
This is (i)impossible (ii)possible when angle between `veca` and `vecb` is `60^@`, (iii)possible when angle between `veca` and `vecb` is `120^@` , (iv)always possible.

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The correct Answer is:
(iii)
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