Question 984108
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Once you have chosen the first two letters, the other two are fixed.  So there are 11 ways to choose the first letter for each of those ways there are 11 ways to choose the second letter, to produce a mirror image string.  But this is out of *[tex \Large 11^4] ways to make any 4 letter string.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
My calculator said it, I believe it, that settles it

*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \