Describe the following sets in Roster form:
{ $x : x$ is a two digit number such that the sum of its digits is $8$ }

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Solution

${x : x is a two digit number such that the sum of its digit is 8}$
$= {17, 26, 35, 44, 53, 62, 71, 80}$

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Describe the following sets in Roster form :

(i) {x : x is a letter before e in the English alphabet}.

(ii) { $x ϵ N : x^{2} < 25$ }

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(iv) $x ϵ N : x = 2 n, n ϵ N$ .

(v) $x ϵ R : x > x$ .

(vi) {x : x is a prime number which is a divisor of 60}

(vii) {x : x ix a two digit number such that the sum of its digits is 8}.

(viii) The set of all letters in the word ' Trigonometry'.

(ix) The set of all letters in the word 'Better'.

The set P = {x:x is a two digit number and sum of whose digits is 6},written in roster form is:

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