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If overset rarr A + overset rarr B = ov...

If ` overset rarr A + overset rarr B = overset rarr A - overset rarr B`,then:

A

`overset rarr A` is a null vector

B

`overset rarr B` is a null vector

C

both `overset rarr A` and `overset rarr B` are null vecors

D

neither `overset rarr A` nor` overset rarr B` is a null vector.

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