Question

can anyone please help me to solve this..
which of the following is a singleton set?
a) {X:|x|<1, X € 1}
b){X :|X| = 5 , X€ 1 }

c){X:x^2 = 1 , X€1 }
d){X : x^2 +X+1=0, x€R}​

Answer 1

Answer:

option 1nd is possible but I think there is some mistakes x belong to 1 is not correct in give set

only value possible is zero

or there is some mistake in question

Answer 2

Answer:

Thankyou for giving me many Thanks ☺️