Two marks exercise problems IV — task. Mathematics State Board, Class 9.

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1. Represent the following sets in Roster form.

(i)

$A =$ The set of all even natural numbers less than

$20$ .

(ii)

$B = \left\{y:y = \frac{1}{2n}, n \in \mathbb{N}, n \le 5 \right\}$

(iii)

$C = \{x:x$ is perfect cube

$27 < x < 216\}$

(iv)

$D = \{x : x \in \mathbb{Z}, -5 < x \le 2\}$

2. Represent the following sets in set builder form.

(i)

$B =$ The set of all Cricket players in India who scored double centuries in One
Day Internationals.

(ii)

$C = \left\{\frac{1}{2}, \frac{2}{3}, \frac{3}{4}, ...\right\}$

(iii)

$D =$ The set of all Tamil months in a year.

(iv)

$E =$ The set of odd Whole numbers less than

$9$ .

3. Represent the following sets in descriptive form.

(i)

$P =$

$\{$ January, June, July

$\}$

(ii)

$Q = \{7, 11, 13, 17, 19, 23, 29\}$

(iii)

$R = \{x : x \in \mathbb{N}, x < 5 \}$

(iv)

$S = \{x:x$

$\{$ is a consonant in English alphabets (\}\)

Important!

This is a self assessment task. Solve this question and assess the solution steps after the completion of test on your own.

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6. Two marks exercise problems IV