applying formula to entire colum

I am new to macro and will like to know how to apply a formula to an entire column and wat is its code.
I want to apply formula to column AR and it goes,
=sumif(I:I,I2,N:N)
the formula has to start from 2nd row coz first row wld contain a heading.
how shld i apply it.
any help would be appreciated
Thanks in advance
REGARDS,
VIPUL

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