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A Formula for Pascal's Triangle

Well ... "A formula" is not quite the right phrase here, but I will show you in this video how to write down a formula for the 87-th entry of the 198-th row of Pascal's triangle (or any other entry of your choosing) in less than two seconds! And once you see where these entries are coming from, you are all set to understand the binomial theorem. (It's another video!)

Why is expanding a binomial of the form (x + y)

WARNING: This video does rely on having seen the "A Formula for Pascal's Triangle" video just so you know what the entries of Pascal's triangle actually count.

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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