Q 1: Let * be a binary operation defined on Q. Check if a*b = ab, for a,b € Q is associative. Answer:

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

Q 3: Let * be a binary operation defined on Q. Check if a*b = ab, for a,b € Q is commutative. Yes No

Q 4: Find the identity element on a*b = a+ab, a, b € 1 Answer:

Q 5: Let A = N x N and let * be a binary operation on A defined by (a,b)*(c,d) = (ac, bd). Show that (A,*) is associative. Answer:

Q 6: Find the identity element if a*b = a+b+ab , a, b € 1 Answer:

Q 7: Let * be a binary operation defined on Q. Check if a*b = a^{2}+b^{2}, for a,b € Q is commutative. No Yes

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

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