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High School Mathematics - 2
5.2 Laws of Binary Operations




Directions: Answer the following.
Q 1: Find the identity element on a*b = a+ab, a, b 1
Answer:

Q 2: Let * be a binary operation defined on Q. Check if a*b = a-b, for a,b Q is associative.
Answer:

Q 3: Let a*b = l.c.m of (a,b), a, b N, find 3*5
8
15
12

Q 4: Let * be a binary operation defined on Q. Find if a*b = ab/4 , for a,b Q is associative.
Answer:

Q 5: Find the identity element if a*b = a+b+ab , a, b 1
Answer:

Q 6: Let a * b be a binary operation on N given by a * b = l.c.m (a,b), a, b, N, find 2*4
4
8
2

Q 7: Let * be a binary operation defined on Q. Check if a*b = a2+b2, for a,b Q is commutative.
Yes
No

Q 8: For I = (-2,-1,0,1,2) and the binary operation of addition defined on I, ehat is the inverse of -2.
2
1
0

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!


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