Question

A*(3×4) matrix has
a) 3 columns 4 rows
b) 3 rows 4 columns
c) 12 rows 7 columns
d) 12 columns 7 rows ​

Answer 1

Answer:

ANSWER

Given matrix A has x rows and x+5 columns.The matrix B has y rows and 11−y columns and also AB and BA exist,

∴ number of columns of A is equal to number of rows of B,

⟹x+5=y,

and also number of columns of B is equal to number of rows of A,

⟹x=11−y,

Solving the both linear equations gives,

y=8 and x=3

Hence, the answer is 3 and 8.