In DNA, there are 4 different kinds of nucleotides. A, T, C and G
In RNA, there are also 4, but T has been replaced by U. (I think. It's been awhile)
So there are 81 combos that you might see in real life, but there are 243 that you could prepare in a lab.
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It has four.
There are 9 * 8 * 7, or 504, three letter permutations that can be made from the letters in the work CLIPBOARD.
6
Six.
There are three that I can see, there's clip, board and lip.