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### High School Mathematics - 25.2 Laws of Binary Operations

 Directions: Answer the following.
 Q 1: Find the identity element if a*b = a+b+ab , a, b € 1Answer: Q 2: Let a*b = l.c.m of (a,b), a, b € N, find 3*512158 Q 3: Let * be a binary operation defined on Q. Check if a*b = a2+b2, for a,b € Q is commutative.NoYes Q 4: Let * be a binary operation defined on Q. Check if a*b = a-b, for a,b € Q is commutative.YesNo Q 5: Let a * b be a binary operation on N given by a * b = l.c.m (a,b), a, b, € N, find 2*4482 Q 6: Let * be a binary operation defined on Q. Check if a*b = a-b, for a,b € Q is associative.Answer: Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!

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