Two marks example problems II — task. Mathematics State Board, Class 9.

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1. Insert the appropriate symbol

$\subseteq$ or

$\nsubseteq$ in each blank to make a true statement.

(i)

$\{10, 20, 30\}$

$\{10, 20, 30, 40 \}$

(ii)

$\{p, q, r\}$

$\{w, x, y, z\}$

2. Find the number of subsets and the number of proper subsets of a set

$X = \{a, b, c, x, y, z\}$ .

Number of subsets

$=$

Number of proper subsets

$=$

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