# geometry

In the English alphabet, there are 7 capital letters that look the same after being rotated 180∘. Those letters are H, I, N, O, S, X, and Z. How many different 3 letter "words" can be made from these letters such that when the word is rotated 180∘, the resulting word is the same?

1. 👍
2. 👎
3. 👁
1. Clearly the 1st and 3rd letter must be the same, but the middle can be any of the 7 letters

number of ways = 7 x 7 x 1 = 49

1. 👍
2. 👎
2. SOS

1. 👍
2. 👎
3. It’s not right

1. 👍
2. 👎
4. It’s not right jishca

1. 👍
2. 👎

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