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Question

If A2A+I=0 then A1 =

A
A2
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B
A+I
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C
IA
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D
AI
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Solution

The correct option is C IA
A2A+I=0
Pre- multiply with A1 on both sides,
A1A2A1A+A1=A10
AI+A1=0
A1=IA.
option c is correct.

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