Consider the following sets. Are the statements in parts (a)-(d) true or false? Explain.

[tex]\[
\begin{array}{l}
P = \{2, 4, 6, 8, \ldots\} \\
S = \{3, 6, 9, 12, \ldots\} \\
T = \{6, 12, 18, 24, \ldots\}
\end{array}
\][/tex]



Answer :

Sure, let's analyze each part of the question step by step:

Given sets:
[tex]$ \begin{array}{l} P=\{2,4,6,8, \ldots\} \quad \text{(Even numbers starting from 2)} \\ S=\{3,6,9,12, \ldots\} \quad \text{(Multiples of 3 starting from 3)} \\ T=\{6,12,18,24, \ldots\} \quad \text{(Multiples of 6 starting from 6)} \end{array} $[/tex]

a) Is [tex]\(6\)[/tex] in [tex]\(P\)[/tex], [tex]\(S\)[/tex], and [tex]\(T\)[/tex] simultaneously?

We need to check if 6 is an element of all three sets.

- 6 is present in [tex]\( P \)[/tex] since it is an even number.
- 6 is present in [tex]\( S \)[/tex] since it is a multiple of 3.
- 6 is present in [tex]\( T \)[/tex] since it is a multiple of 6.

Since 6 is in all three sets, the statement is True.

b) Is [tex]\( P \subseteq T \)[/tex] or [tex]\( S \subseteq T \)[/tex]?

We need to check if all elements of [tex]\( P \)[/tex] are in [tex]\( T \)[/tex] or if all elements of [tex]\( S \)[/tex] are in [tex]\( T \)[/tex].

- [tex]\( P \)[/tex] (even numbers) includes numbers like 2, 4, which are not multiples of 6, so [tex]\( P \subseteq T \)[/tex] is not true.
- [tex]\( S \)[/tex] (multiples of 3) includes numbers like 3, 9, which are not multiples of 6, so [tex]\( S \subseteq T \)[/tex] is not true.

Since neither [tex]\( P \subseteq T \)[/tex] nor [tex]\( S \subseteq T \)[/tex] is true, the statement is False.

c) Is [tex]\( T \subseteq P \)[/tex] and [tex]\( T \subseteq S \)[/tex]?

We need to check if all elements of [tex]\( T \)[/tex] are in [tex]\( P \)[/tex] and also in [tex]\( S \)[/tex]:

- All elements in [tex]\( T \)[/tex] (multiples of 6) are even numbers, so [tex]\( T \subseteq P \)[/tex].
- All elements in [tex]\( T \)[/tex] (multiples of 6) are also multiples of 3, so [tex]\( T \subseteq S \)[/tex].

Since both [tex]\( T \subseteq P \)[/tex] and [tex]\( T \subseteq S \)[/tex] are true, the statement is True.

d) Is the intersection of [tex]\( P \)[/tex], [tex]\( S \)[/tex], and [tex]\( T \)[/tex] non-empty?

We need to check if there is at least one common element in sets [tex]\( P \)[/tex], [tex]\( S \)[/tex], and [tex]\( T \)[/tex]:

- The number 6 is in [tex]\( P \)[/tex], [tex]\( S \)[/tex], and [tex]\( T \)[/tex].

Since the intersection is non-empty, the statement is True.

So the outcomes are:
- a) True
- b) False
- c) True
- d) True