code: # Mathematics > Linear Algebra Foundations > Linear Algebra Foundations #4- Matrix Multiplication
  # Matrix Multiplication of 2x2 Matrices
  #
  # https://www.hackerrank.com/challenges/linear-algebra-foundations-4-matrix-multiplication/problem
  #
  
  import numpy as np
  
  a = np.matrix([[1,2,3], [2,3,4], [1,1,1]])
  b = np.matrix([[4,5,6], [7,8,9], [4,5,7]])
  print(a * b)
  
  """
  réponse:
  
  30
  36
  45
  45
  54
  67
  15
  18
  22
  """
apis: numpy.matrix