Using PnC (Permutation and Combinations), find the number of ways we ca arrange n pairs of parentheses such that they make a valid combination.

For example 2 pairs: ()() and (()) are valid ones

and for 1 pair () is valid and )( is invalid.

Please help me out, and a proper explanation would be helpful.

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`*italics*`

or`_italics_`

italics`**bold**`

or`__bold__`

boldNote: you must add a full line of space before and after lists for them to show up correctlyparagraph 1

paragraph 2

`[example link](https://brilliant.org)`

`> This is a quote`

Remember to wrap math in \( ... \) or \[ ... \] to ensure proper formatting.`2 \times 3`

`2^{34}`

`a_{i-1}`

`\frac{2}{3}`

`\sqrt{2}`

`\sum_{i=1}^3`

`\sin \theta`

`\boxed{123}`

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