2023 · Q69
Which one of the following is not a commutative law?
General Mental Ability, Quantitative Aptitude and StatisticsNumber system and arithmetic
- AA*b = b*A
- BA+b = b+A
- CA-b = b-A
- DA*B = B*A
Explanation
The commutative law requires A op B = B op A. Addition and multiplication satisfy this (options a, b, d), but subtraction does not: in general A - B is not equal to B - A. Hence (c) 'A - b = b - A' is not a commutative law.