Many Excel users are often required to use array formulas, below note will help to understand how to :-
a) Create an Array formula
b) Convert an existing formula to an Array formula
The keyboard shortcut to apply Array functionality to a formula is :-
Ctrl + Shift + Enter
If you have already entered the formula and now wish to convert the same into an array formula,
Just select the cell, press F2 and press key combination Ctrl + Shift + Enter.