Question

http://prntscr.com/127hu7
Is it A or D? I believe its A

Answer 1

yes it is A.Product of a 2*3 and 3*1 matrix gives 2*1 matrix.You don't even have to calculate the answer.

Answer 2

Remember the rule for matrix multiplication if a matrix A has m rows and n columns i.e A is m*n matrix and B is r*s matrix than multiplication is only possible if n=r and the resulting matrix will be AB = m*s.
Hope I have clearly explaned the concept.

Answer 3

A

Answer 4

yes your answer is A

Answer 5

Thank you!!

Answer 6

Welcome