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Q.

Let S be the set of real numbers. For a,b∈S, relation R is defined by aRb⇔|a-b|<1 then R is

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a

only reflexive

b

only symmetric

c

only transitive

d

Reflexive & symmetric

answer is D.

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Detailed Solution

Given realation R defined by aRb⇔|a-b|<1 Clearly |a-a|<1⇒The relation R is reflexive  If |a-b|<1⇒|b-a|<1  ∵a-b=b-a∴It is symmetric. But it need not be transitive   1-2<1 and 2-3<1 but 1-3is not <1 ∴The relation R is reflexive and symmetric
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Let S be the set of real numbers. For a,b∈S, relation R is defined by aRb⇔|a-b|<1 then R is