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To work out Pascal's Triangle, you start with two ones at the top. From there on, you add the two numbers above to get the next number. The numbers on the outside will always be 1.

....1.....1

...1...2...1

..1..3...3..1

.1.4...6...4.1

1 5 10 10 5 1

Q: How do you work out a pascals triangle?

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in the 11th century...

(a+b)7

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Blaise Pascal.

Pascal didn't invent pascals triangle, he just made It popular. A Chinese mathematician invented it in about 1015.

The expanded binomial is another name for Pascal's triangle.