(i) A = {x : x ∈ N and x < 100}

A = {1, 2, , 4, ... , 98, 99}

This set is , because there are numbers possible to count.

(ii) B = {x : x ∈ N and x ≤ 5}

B = {, , , , }

This set is because there are numbers possible to count.

(iii) C = {1² , 2², 3², ……}

C = {1² , 2², 3², ……}

This set is because there are numbers.

(iv) D = {1, 2, 3, 4}

D = {1, 2, 3, 4}

This set is because there are numbers that are possible to count.

(v) {x : x is a day of the week}

E = {Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday}

This set is , because there are days in a week possible to count.