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Kitty [74]
3 years ago
5

Write the formal descriptions of the following sets: (a) The set containing the numbers 5, 9, and 27. (b) The set that contains

all the natural numbers less than 2. (c) The set containing the empty string. (d) The set containing nothing at all.
Computers and Technology
1 answer:
Dominik [7]3 years ago
7 0

Answer: a) =\left \{ 5,\,9,\,27 \right \}

(b) \left \{ x\ : X\varepsilon\mathbb{N} \right \text{and}\ x

(c) \left \{\epsilon \right \}

(d) \left \{\right \}=\phi

Explanation:

The formal description of the given sets are as follows :-

a) The set containing the numbers 5, 9, and 27.

=\left \{ 5,\,9,\,27 \right \}

(b) The set that contains all the natural numbers less than 2.

\left \{ x\ : X\varepsilon\mathbb{N} \right \text{and}\ x

(c) The set containing the empty string.

We know that in formal description, the empty string is denoted with \epsilon.

Thus, the required set : \left \{\epsilon \right \}

(d) The set containing nothing at all.

\left \{ \right \}=\phi

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</p><p> // The function evaluates the answer and displays result</p><p> function displayAnswer1() {</p><p> if (document.getElementById('option-11').checked) {</p><p> document.getElementById('block-11').style.border = '3px solid limegreen'</p><p> document.getElementById('result-11').style.color = 'limegreen'</p><p> document.getElementById('result-11').innerHTML = 'Correct!'</p><p> }</p><p> if (document.getElementById('option-12').checked) {</p><p> document.getElementById('block-12').style.border = '3px solid red'</p><p> document.getElementById('result-12').style.color = 'red'</p><p> document.getElementById('result-12').innerHTML = 'Incorrect!'</p><p> showCorrectAnswer1()</p><p> }</p><p> if (document.getElementById('option-13').checked) {</p><p> document.getElementById('block-13').style.border = '3px solid red'</p><p> document.getElementById('result-13').style.color = 'red'</p><p> document.getElementById('result-13').innerHTML = 'Incorrect!'</p><p> showCorrectAnswer1()</p><p> }</p><p> if (document.getElementById('option-14').checked) {</p><p> document.getElementById('block-14').style.border = '3px solid red'</p><p> document.getElementById('result-14').style.color = 'red'</p><p> document.getElementById('result-14').innerHTML = 'Incorrect!'</p><p> showCorrectAnswer1()</p><p> }</p><p> }</p><p> // the functon displays the link to the correct answer</p><p> function showCorrectAnswer1() {</p><p> let showAnswer1 = document.createElement('p')</p><p> showAnswer1.innerHTML = 'Show Corrent Answer'</p><p> showAnswer1.style.position = 'relative'</p><p> showAnswer1.style.top = '-180px'</p><p> showAnswer1.style.fontSize = '1.75rem'</p><p> document.getElementById('showanswer1').appendChild(showAnswer1)</p><p> showAnswer1.addEventListener('click', () => {</p><p> document.getElementById('block-11').style.border = '3px solid limegreen'</p><p> document.getElementById('result-11').style.color = 'limegreen'</p><p> document.getElementById('result-11').innerHTML = 'Correct!'</p><p> document.getElementById('showanswer1').removeChild(showAnswer1)</p><p> })</p><p> }</p><p>

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