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JEE MATHEMATICS MCQ: RELATIONS

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Which one of the following is not an equivalence relation?
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Correct option: B
R2R_2 on RR defined by a R2 b⇔1+ab>0a \,R_2 \,b \Leftrightarrow 1+a b>0 for all a,b∈R.a, b \in R.
Option B is the correct answer because R2R_2 is not transitive, and therefore not an equivalence relation. An equivalence relation must be reflexive, symmetric, and transitive.

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In the set Z\mathrm{Z} of all integers, which of the following relation RR is not an equivalence relation? Let N\mathrm{N} denote the set of all natural numbers and R\mathrm{R} be the relation on N×N\mathrm{N} \times \mathrm{N} defined by (a,b)R(c,d)(\mathrm{a}, \mathrm{b}) \mathrm{R}(\mathrm{c}, \mathrm{d}) if ad(b+c)=bc(a+d)a d(b+c)=b c(a+d), then R\mathrm{R} is Let WW denote the words in the English dictionary. Define the relation RR by: R={(x,y)∈W×W∣R=\{(x, y) \in W \times W \mid the words xx and yy have at least one letter in common }\} Let SS be the set of all real numbers. Then, the relation R={(a,  b):1+ab>0}R = \{ \left( {a,\;b} \right):1 + ab > 0\} on SS is Let XX be a family of sets and RR be a relation on XX defined by ' AA is disjoint from BB '. Then RR is: RR is relation on NN given by R={(x,  y):4x+3y=20}R = \left\{ {\left( {x,\;y} \right):4x + 3y = 20} \right\}. Which of the following belongs to RR?
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