31. The compound interest on a certain sum for the first year at 4% is Rs 25.
The compound interest for 2 years
at the same rate on the same sum
will be:
[2004]
(a) Rs. 50 (b) Rs. 51
(c) Rs. 53 (d) Rs. 54

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