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MATHS [1 Mark Question Answer]

Sets · ICSE STD 8 (ICSE - English Medium). 55 questions.

Questions · Page 2 of 2

[1 Mark Question Answer]

Question 511 Mark
Write the following sets in set-builder $(Rule Method) $ form $:B_5 =\{-5, -4, -3, -2, -1\}$
Answer
$B_5 = \{-5, -4, -3, -2, -1\}$
       $= {x : x \in Z, -5 \leq x \leq -1}$
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Question 521 Mark
Write the following sets in set-builder $(Rule Method)$ form : $B_4= \{8, 27, 64, 125, 216\}$
Answer
$B_4= \{8, 27, 64, 125, 216\}$
$= \{x : x = n3 ; n \in N\  and\  2 \leq n \leq 6\}$
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Question 531 Mark
Write the following sets in set$-$builder $(Rule Method)$ form $: $ $B _3=\left\{\frac{1}{3}, \frac{3}{5}, \frac{5}{7}, \frac{7}{9}, \frac{9}{11}, \ldots\right\}$
Answer
$B _3=\left\{\frac{1}{3}, \frac{3}{5}, \frac{5}{7}, \frac{7}{9}, \frac{9}{11}, \ldots\right\}$
$=\left\{x: x=\frac{n}{n+2}\right.$,where n is an odd natural number$\}$
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Question 541 Mark
Write the following sets in set$-$builder $($Rule Method$)$ form : $B_2 = \{11, 13, 7, 19\}$
Answer
$B_2 = \{11, 13, 17, 19\}$
$= \{x : x$ is a prime number between $10$ and $20\}$
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Question 551 Mark
Write the following sets in set$-$builder $($Rule Method$)$ form$ :$ $B_1 = {6, 9, 12, 15 ....}$
Answer
$B_1 = {6, 9, 12, 15 ....}$
$= {x : x = 3n + 3; n \in N}$
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[1 Mark Question Answer] - Page 2 - MATHS STD 8 Questions - Vidyadip