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## Homework Statement

## Homework Equations

3. The Attempt at a Solution [/B]

## |3 \rangle = |1 \rangle - 2 ~ |2 \rangle ##

So, they are not linearly independent.

One way to find the coefficients is :

## |3 \rangle = a~ |1 \rangle +b~ |2 \rangle ## ...(1)

And solve (1) to get the values of a and b.

Is there any other easier way?

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