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In Excel, $A$1 is an absolute reference, meaning it will not change when the formula is copied to another cell. The dollar signs ($) lock both the column and the row. Knowledge Booster: 1. A1 is a relative reference that adjusts when copied. 2. Absolute references are essential for fixed-value formulas. 3. Mixed references like $A1 or A$1 lock only one dimension. 4. Shortcut: Press F4 to toggle reference types.
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