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If veca is a non-zero vector of magnitud...

If `veca` is a non-zero vector of magnitude `'a'` and `'lambda'` is a non-zero scalar, such that `|lambdaveca|=1`, then :

A

1) `lambda=1`

B

2) `lambda=-1`

C

3) `a=|lambda|`

D

4) `a=1/(|lambda|)`.

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