aubrey uses the following formula to calculate a required value. which elementd of the formula use mixed cell referencing

Answer:
$1A
Step-by-step 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