Answer No : 22 : 
import numpy as np  
array1=np.array([[1,2,3],[4,5,6],[7,8,9]],ndmin=3)  
array2=np.array([[9,8,7],[6,5,4],[3,2,1]],ndmin=3)  
result=np.matmul(array1,array2)  
print(result)
Output:
[[[ 30 24 18]
[ 84 69 54]
[138 114 90]]]