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Equal Vectors

Given A A...

Question

Given
A A A
+ A A
--------------
A B B
If A $^{2} =$ B, then A $\times$ B is:

A

2

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B

1

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C

8

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D

4

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Solution

The correct option is A 8
A A A
+ A A
A B B
This means that, A+A = 2A = B. Also given that A $^{2}$ = B
=> A = 2, B = 4
AB = 2 x 4 = 8.

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