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I like the argument that every number in the row below is formed by summing two numbers from above. So each number above appears twice below. Hence the sum doub

I like the argument that every number in the row below is formed by summing two numbers from above. So each number above appears twice below. Hence the sum doubles.

hollerith 1y ago
You mean, every number in the upper row contributes twice to the lower row.
dhosek 1y ago
Oh, that’s really nice.