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Let * defined on the set {1, 2, 3, 4, 5} by a*b=L.C.M of a and b. Is * a binary operation? Justify your answer.

Posted by Antony Jeslin 4 years, 3 months ago

CBSE > Class 12 > Mathematics

1 answers

Gaurav Seth 4 years, 3 months ago

Consider the composition table :

LCM	1	2	3	4	5
1	1	2	3	4	5
2	2	2	6	4	10
3	3	5	3	12	15
4	4	4	12	4	20
5	5	10	15	20	5

In the given composition table, all the elements are not in the set {1, 2, 3, 4, 5}.

If we consider a = 2 and b = 3, a * b = LCM of a and b = 6 ∉ {1, 2, 3, 4, 5}.

Thus, * is not a binary operation on {1, 2, 3, 4, 5}.

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