The roster form of the set ${x : x$ is a two-digit natural number such that sum of its digits is $9}$

{09, 18, 27, 36, 45, 54, 63, 72, 81, 90}

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(09, 18, 27, 36, 45, 54, 63, 72, 81, 90)

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[09, 18, 27, 36, 45, 54, 63, 72, 81, 90]

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{18, 27, 36, 45, 54, 63, 72, 81, 90}

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Solution

The correct option is D ${18, 27, 36, 45, 54, 63, 72, 81, 90}$
$x y$ such that $x + y = 9$ and $x \neq 0$
$\to {multiple of 9} = {18, 27, . . ., 90}$

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Write the following sets in roster form:

(i) A = {x : x is an integer and -3 < x < 7}

(ii) B = {x : x is a natural number less than 6 }

(iii) C = {x : x is a two-digit natural number such that the sum of its digits is 8 }

(iv) D = {x : x is a prime number which is divisor of 60}

(v) E = The set of all letters in the word TRIGONOMETREY

(vi) F = 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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