## Learning outcomes

After working through this module you will be able to:

- Use the law of combining to count the number of possible combinations of items from one or more sets.
- Apply the law of combining to deduce the number of nucleotide sequences and amino acid sequences in a given context.
- Multiply and divide numbers given in scientific notation.
- Deduce the average number of nucleotide sequences per amino acid sequence.
- Deduce the likelihood of a particular nucleotide sequence being catalogued in BLAST.

## Module contents

1: Combinatorics2: Combining letters into words

3: Many names for large numbers

4: Four-letter alphabet

5: How many base sequences?

6: How many AA sequences?

7: Division

8: How many ways can you make a protein?

9: To be or not to be... in blast

10: Blast: do try this at home

11: Summary