1.

If A is the set of students of a school then write, which of following relations are Universal, Empty or neither of the two. R_(1)={(a,b):a,b " are ages of students and" |a-b| gt 0} R_(2)={(a,b):a,b " are weights ofstudents, and "|a-b|lt0} R_(3)={(a,b):a,b " are students studying in same class"}

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ANSWER :`R_(1)` : is universal RELATION.
`R_(2)`: is EMPTY relation.
`R_(3)`: is NEITHER universal nor empty


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