Given a dataframe df as shown below:

   A        B       D
0  15      17      19
1  16      18      20
2  20      21      22

What will be the result of following code segment ?
(a) df[‘C’] = np.NaN
(b) df[‘C’] = [2,5]
(c) df[‘C’] = [12, 15, 27]

Ans
(a)

  A        B        D      C
0  15      17      19     NaN
1  16      18      20     NaN
2  20      21      22     NaN

Ans
(b) will produce Error

Ans
(c)

   A        B       D      C
0  15      17      19     12
1  16      18      20     15
2  20      21      22     27