Query on re & fa


#1

If S be an infinite set and S1 ……….,Sn be sets such that S1∪S2∪S3∪S4………∪Sn=S,then
a) atleast one of the set Si is a finite set
b) not more than one of the sets Si can be finite
c) atleast one of the sets Si is an infinite set
d) not more than one of the sets Si can be infinite


#2

See here answer must be C since to make a set infinitie at least one of the set be infinite


#3

The answer should be “c” as for the requirement of a set to be infinite, minimum requirement can be at least one of the sets should be infinite.