There are four types of counter in a bag. The table shows the number of each type of counter in the bag.
Type of counter
red circle
green circle
red square
green square
Number of counters
26
42
37
39
There are more green counters than red counters.
How many more?

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b