Question

Let A {x : x =n -2,n< 5}. Find A when
(1) n= W,n ∈ W
(2) n = N, n ∈ N
(3) n ∈ I =I​​

Answer 1

Answer:

Natural numbers less than 5 are 1,2,3,4.

Given x=2n, putting n=1,2,3,4 ,we get,

x=2×1,2×2,2×3,2×4

=2,4,6,8.

The given set i.e.,A can be written as {2,4,6,8}

(Every set is a subset of universal set i.e., A ⊂ξ)