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Miller Index Question

Ok, just wanted to check whether I was doing this right.

The question is:

A plane is parallel to the x axis and cuts the y and z axis at the same value. This is a:

a) [100] plane
b) [101] plane
c) [111] plane
d) [011] plane

Now, obviously it can't be [101] as that gives different values of y and z.

In my mind it's obviously [011] as both the [100] and [111] planes cut the x axis at 1 and therefore cannot be parallel to it.

I'm sure that I'm right, but can somebody please just confirm for me that I'm not doing anything daft.

Thanks.

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