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multiple sequence alignment

If you are doing a multiple sequence alignment on 90 sequence, how many pairwise alignment need to be done?

alignment

This sounds very much like a course question and not an actual scientific problem.

1 answer

90 * 89 / 2 = 4005

The Handshake Problem: in a room of n people, how many different handshakes are possible: n * (n-1) / 2

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