Question

Write the following sets in roster form. (Communication)

(i) A = { x : x is a two digital natural number such that the sum of its digits

is 8}

(ii) B = { x: x is a natural number and x2

< 40 }

(iii) C = { x: x is a prime number which is a divisor of 60 }

(iv) D= { x: x is an integers , x2

=4}​

Answer 1

Set builder form:

(i). A = { x : x is a two digital natural number such that the sum of its

digits is 8}

Roster form:

A = { 17, 26, 35, 44, 53, 62, 71, 80}

(ii). Set builder form:

B = { x: x is a natural number and x2

< 40 }

Roster form:

B = { 1, 2 , 3, 4, 5, 6 }

(iii). Set builder form:

C = { x: x is a prime number which is a divisor of 60 }

Roster form:

C = { 2, 3, 5 }

(iv). Set builder form:

D= { x: x is an integers , x2

=4}

Roster form:

D = { -2 , 2 }

Answer 2

Answer:

A={17.26.35.44.53.62.71.80}

B={1,2,3,4,5,6}

C={2,3,5}

D={-2,2}

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