How do I combine two different row string values into a single new row value?

I have two rows of a dataframe likeso:

   Jan  Feb
a   1    3
b   2    4  

I want to create a new dataframe row that combines the two rows (by name because I have to do this for multiple sets of rows of the df) into one row like this:

   Jan  Feb
a   1    3
b   2    4  
c  1/2  3/4 

And I do not mean just division as the data types of the actual values are string, I want to concatenate. I feel like there has to be an obvious solution but nothing I have found online is working.

>Solution :

Try this:

df.loc['c', :] = df.apply(lambda x: f"{x[0]}/{x[1]}")
print(df)

Output:

   Jan  Feb
a  1.0  3.0
b  2.0  4.0
c  1/2  3/4