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Consider the following statements.

S1 : union of any finite number of countable sets is countable.

S2 : union of infinite number of countable sets is countable

S3 : cross product of any finite number of countable sets is countable.

S4 : cross product of infinite number of countable sets is countable.

Which of the above statements is TRUE ?

A) Only S1

B) Only S1) and S3)

C) Only S1),S2),S3)

D) All of S1),S2),S3),S4)

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Answer will be B, only as union and cross product of countable sets is always countable.

B) Only S1) and S3)

as finite sets are always countable
by Active (4k points)

+1 vote