What is Pascal's triangle?

1 Answer
Dec 29, 2014

Pascal's triangle is a triangle of numbers bordered by ones on the right and left sides. Every number inside the triangle is the sum of the two numbers above it.

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You can use Pascal's triangle to predict the intensity ratios of proton NMR multiplets.

Thus, an AX doublet has 1:1 or equal intensities. An AX₂ triplet has intensity ratios of 1:2:1. An AX₃ quartet has 1:3:3:1 ratios, etc.

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