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  • If A is of the order 3 x 5 and B is of the order a x b. Then if BA is valid and AB is not valid.Which values of a and b are not possible?Option: 1 a

If A is of the order 3 x 5 and B is of the order a x b. Then if BA is valid and AB is not valid.Which values of a and b are not possible?

Option: 1

a = 4, b = 3


Option: 2

a = 5, b = 3


Option: 3

a = 6, b = 3


Option: 4

a = 7, b = 3


Answers (1)

best_answer

As we learnt

 

Conformable matrices for multiplication -

A_{m\times n} \times B_{n\times p}

- wherein

Number of columns of first matrix is equal to number of rows in second matrix

 

 

 

 A_{3\times 5}\: \: and\: \: B_{a\times b}

BA is valid so b = 3

and AB is not valid so a \neq 5

 

Posted by

Rishi

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