# Fundamental Principles of Counting

**Principle of Addition :****Principle of Multiplication :**

^{n}**P**_{r}**and**^{n}**C**_{r}**:**- P(n, r) or
^{n}P_{r}= - C(n, r) or
^{n}C_{r}= . The symbol^{n}C_{r}is also deonoted by .

- P(n, r) or

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**Principle of Addition :****Principle of Multiplication :**

^{n}**P**_{r}**and**^{n}**C**_{r}**:**- P(n, r) or
^{n}P_{r}= - C(n, r) or
^{n}C_{r}= . The symbol^{n}C_{r}is also deonoted by .

- P(n, r) or

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