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python - Make new column in Panda dataframe by adding values from other columns

I have a dataframe with values like

A B
1 4
2 6
3 9

I need to add a new column by adding values from column A and B, like

A B C
1 4 5
2 6 8
3 9 12

I believe this can be done using lambda function, but I can't figure out how to do it.

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Very simple:

df['C'] = df['A'] + df['B']

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