Set Concepts

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Step 1: List the letters in the word crook. Step 2: Repeat letters are written only once. Step 3: The letters are c, r, o, k. Answer: {c, r, o, k}…

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Step 1: Count the elements. Step 2: There are 5 elements. Step 3: Write the cardinal number as n(A) = 5. Answer: 5…

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Step 1: Check whether 3 is an element of the set. Step 2: 3 is present in the set. Answer: Yes, 3 ∈ {1, 2, 3, 4, 5}.

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Step 1: Check whether 7 is in the set. Step 2: 7 is not present in the set. Answer: Yes, 7 ¢ {2, 4, 6, 8, 10}.

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Step 1: Natural numbers start from 1. Step 2: They continue without end. Answer: N = {1, 2, 3, 4, 5, ...}…

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Step 1: Integers include negative numbers, 0, and positive numbers. Step 2: Write them in order with dots for continuation. Answer: I = {..., -3, -2, -1, 0, 1, 2, 3, ...}…

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Step 1: Whole numbers start from 0. Step 2: Take only numbers less than 8. Step 3: Write them in order. Answer: A = {0, 1, 2, 3, 4, 5, 6, 7}…

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Step 1: A set must be well-defined. Step 2: It must be clear who is included and who is not. Step 3: Tall is unclear without a fixed limit. Answer: It is not well-defined because the boundary for tall…