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Question

Consider the following statements:
S1: There exist infinite sets A,B, C such that
A(BC) is finite.
S2:
There exist two irrational numbers x and y such that (x+y) is rational.
Which of the following is true about
S1and S2 ?

A
Only S2 is correct
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B
None of S1 and S2 is correct
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C
Both S1 and S2 are correct
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D
Only S1 is correct
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Solution

The correct option is C Both S1 and S2 are correct
S1:
Let A= set of integers
B= set of odd integers
C= set of even integers
A(BC)=ϕ and ϕ is finite set.
Therefore, S1 is true.

S2:
Let two irrational number x and y are respectively
(1+2) and (12)
so x+y=1+2+12
=2 which is rational number
Therefore, S2 is true. Since both S1 and S2 are true, option (c) is true.

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