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Start with 1

Then multiply by the row (7) divided by (1)

1*7/1 = 7

Next drop the multiply by 1 and increase the divide by 1.

7 * 6 / 2 = 21

Keep doing this until you get back to 1

21 * 5 / 3 = 35

35 * 4 / 4 = 35

35 * 3 / 5 = 21

21 * 2 / 6 = 7

7 * 1 / 7 = 1

The line is

1 7 21 35 35 21 7 1

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