Describe the following sets in Roster form: (i) {x ∈ R: x > x} (ii) {x : x is a prime number which is a divisor of 60}

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Describe the following sets in Roster form: (i) {x ∈ R: x > x} (ii) {x : x is a prime number which is a divisor of 60}

Answers:

(i)

Real number = it’s value

Then, the roster form of real numbers which has less value than itself has no such numbers.

∴ Roster form = ϕ.

Type of set – Null.

(ii)

x is a prime number which is a divisor of 60

Then, x = 2, 3, 5.

∴ Roster form = {2, 3, 5}.

i

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