Question

which of the following is a singleton set​

Answer 1

Answer:

Correct option is

A

{x:∣x∣=5,xϵN}

(a) ∣x∣=5⇒x=5 (∵xϵN)

∴ Given set is singleton.

(b) ∣x∣=6⇒x=−6,6 (∵xϵZ)

∴ Given set is not singleton.

(c) x

2

+2x+1=0⇒(x+1)

2

=0⇒x=−1,−1.

Since −1



ϵN, given set =ϕ

(d) x

2

=7⇒x=±

7

Since xϵN, given set =ϕ.

Step-by-step explanation:

please mark me as a brainlist

Answer 2

Step-by-step explanation:

first put the following numbers