Question array1 = np.array([[1, 2, 3], [4, 5, 6]]) array2 = np.array([[7, 8, 9], [10, 11, 12]]) 1. Stack arrays in sequence horizontally (column wise). 2. Stack arrays in sequence vertically (row wise) 3. Stack arrays in sequence depth wise (along third axis) 4. Appending arrays after each other, along a given axis 5. Append values to the end of an array Program: - import numpy as np array1 = np.array([[ 1 , 2 , 3 ], [ 4 , 5 , 6 ]]) array2 = np.array([[ 7 , 8 , 9 ], [ 10 , 11 , 12 ]]) print ( "Orignal Array 1:- \n" ,array1, "\n" ) print ( "Orignal Array 2:- \n" ,array2, "\n" ) print ( "Stack arrays in sequence horizontally (column wise). :- \n" ,np.hstack((array1,array2))) print ( "Stack arrays in sequence vertically (row wise) :- \n" ,np.vstack((array1,array2))) print ( "...