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# sum of subtraction every two row

## sum of subtraction every two row

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I have been thinking of this but cant figure it out:
For example I have a Col start from row 10 (B10) going down. The number of row can be variable, but it should be odd number, the last row will not be count. Now I want the SUM of the subtraction of every 2 cell next together. Ex: I have B10:B21 then I need (B2-B1)+(B4-B3)+(B6-B5)+.+(B20-B19). How can I formula this?

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