||'''Book'''|| Advanced Engineering Mathematics ||
 ||'''Author'''|| Erwin Kreyszig ||
 ||'''Edition'''|| 8th Edition ||

/* code_begins */

{{{
A = matrix ([[1,2],[2,4]])
print A
B = matrix ([[2,1,4],[3,1.5,6]])
print B
b = var('b')
bc = var('bc')
M = matrix ([[1,b],[c,bc]])
print M
D = A * B
print D
D.rank()
E = A * M
print E
E.rank()
}}}

/* code_ends */

 * '''Solution by''': 
   * <sri valli>, <student>, <snist>
   * <krishna>, <student>, <snist>