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These letters are the same when they are made upside-down: H, I, N, O, S, X, and Z.

Mathematics
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And what is the Question?
How many three-letter "words" can be formed that are the same when they are upside-down?
Fake Question....... not a mathematics question

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Other answers:

At first, I thought of \(7P3\), but then I saw that repetition is allowed, so I thought of \(21P3\)
@goformit100 It's called combinatorics.
Neither is correct.
Ok Then :)
7*7*1
so, 49
how the 1?
it might be 7 * 7 * 7
The first and the last letter must be same
Oh yes!
looks s and z made upside-down, they were not same :) |dw:1360990401416:dw|
@RadEn That is the mirror image, not the upside-down image. :-P
Ohhhh... missunderstanding :)

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