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MATHS [3 marks sum]

Sets · ICSE STD 7 (ICSE - English Medium). 2 questions.

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[3 marks sum]

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Question 13 Marks
There is a group of 50 persons who can speak English or Tamil or both. Out of these persons, 37 can speak English and 30 can speak Tamil :
How many can speak Tamil only?
Answer
13
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Question 23 Marks
Let $A =\{x: x$ is a multiple of $2, x<15\}$,
$B =\{x: x$ is a multiple of $3, x<20\}$,
$C =\{x: x$ is a prime, $x<20\}$.
Find:
(a) $A \cup B$ (b) $A \cup C$ (c) $B \cup C$ (d) $A \cap B$ (e) $A \cap C$ (f) $B \cap C$
Answer
(a) $A \cup B =\{2,3,4,6,8,9,10,12,14,15,18\}$
(b) $A \cup C =\{2,3,4,5,6,7,8,10,11,12,13,14,17,19\}$
(c) $B \cup C =\{2,3,5,6,7,9,11,12,13,15,17,18,19\}$
(d) $A \cap B =\{6,12\}$
(e) $A \cap C =\{2\}$
(f) $B \cap C =\{3\}$
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[3 marks sum] - MATHS STD 7 Questions - Vidyadip