https://docs.google.com/spreadsheets/d/1_MeiySJHI8OD84BPDOj_z57My-TXbs2ey4AOkQP3zug/edit?usp=sharing
I am sharing the link of sheet on which I want solution on that sheet also I have tried to explain you the question.
I have three columns I want sum of third col3 value based on first two column value
if col1 = 2 and col2 = 40; Then I should get the sum of all value in col3 in which col1 = 2 and col2 = 40
if the col1 contains value of 2 and col2 contains 40 than sum of col3 value only those col3 value in which col1=2 and col2=40
so if any of the column value changes than sum of col3 also sum according to that.