The ARRAYFORMULA allows you to replace a series of formulas with just one. The function works with ranges instead of single cells.
🕒 Timestamps:
0:00 The Simple Way (without ARRAYFORMULA)
0:44 SUM a range with ARRAYFORMULA
1:24 Make it a long range
2:09 Tighten up the range
2:22 Nested ARRAYFORMULA to get an AVERAGE
3:35 UNIQUE function
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