In which case is it legal to drive through a crosswalk?
a. when pedestrians are crossing but you have a green light
b. when all pedestrians are in lanes other than yours
c. when you can safely avoid pedestrians in your lane
d. none of the above

sorry, i don't know i just need points, i'm new here. chao

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