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Problem:
Calculating the sum of the last n numbers in List1 (column A) for each value of N in column B.
Solution:
Use the SUM, OFFSET, and COUNTA functions as shown in the following formula:
=SUM(OFFSET($A$2,COUNTA($A$2:$A$7)-1,0,-B2))
Problem:
Calculating the sum of the last n numbers in List1 (column A) for each value of N in column B.
Solution:
Use the SUM, OFFSET, and COUNTA functions as shown in the following formula:
=SUM(OFFSET($A$2,COUNTA($A$2:$A$7)-1,0,-B2))
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