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Ex 1.4

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Chapter 1 Class 12 Relation and Functions

Serial order wise

Last updated at Aug. 11, 2021 by Teachoo

Maths Crash Course - Live lectures + all videos + Real time Doubt solving!

Ex 1.4, 9 Let * be a binary operation on the set Q of rational numbers as follows. Find which are associative and which are commutative : (iii) a * b = a + ab Check commutative * is commutative if a * b = b * a Since a * b ≠ b * a * is not commutative a * b = a + ab Check associative * is associative if (a * b) * c = a * (b * c) Since (a * b) * c ≠ a * (b * c) * is not an associative binary operation