Aubrey uses the following formula to calculate a required value. Which elements of the formula use mixed cell referencing?

Answer:
$1A
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Explanation:
The elements of a formula only can have the following format:
1) Letter Number as C1
2) Letter $ Number as A$1
3) $ Letter Number as $A1
4) $ Letter $ Number as $A$1
The element $1A is not in the format