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Q.

Let P(S) denote the power set of S={1,2,3,,10}. Define the relations R1 and R2on P(S) as AR1B if ABCBAC=ϕ and AR2B if ABC=BAC,A,BP(S). Then :

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a

only R1 is an equivalence relation

b

only R2 is an equivalence relation

c

Both  R1 and R2 are equivalence relations

d

Both  R1 and R2 are not equivalence relations

answer is A.

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Detailed Solution

detailed_solution_thumbnail

AR1BABCBAC=ϕ
(i) for reflexive AR1A 
AACAAC=ϕϕ=ϕ
(ii) symmetric
AR1BBR1AABCBAC=ϕAR1BBACABC=ϕBR1A
It is symmetric
(iii) Transitive
AR1BABCBAC=ϕBR1CBCCCBC=ϕABC=ϕ&BAC=ϕBCC=ϕ&CBC=ϕACC=ϕ&CAC=ϕ
R1is transitive
R1 is equivalence relation.
R2:AR2BABC=BACABC=μ(BA)
Similarly BAC=μ(AB)
Question Image
If AR2BAB=BA
i) Reflexive A – A = A – A
ii) Symmetric
AR2BAB=BABR2ABA=AB
iii) Transitive
AR2BAB=BA     ...(1)
and BR2CBC=CB .....(2)
 (1) + (2) AC=CAAR2CCR2A
 R2 is also equivalence

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