Math Problem Statement

is anb a subset of c if a = {n e N: 2|n} and b = {n e N: 3|n} and c= {n e N: 6|n}

Solution

Let's define the sets step by step:

  • Set A: A={nN:2n}A = \{ n \in \mathbb{N} : 2 \mid n \} — this means that AA consists of all natural numbers divisible by 2, i.e., A={2,4,6,8,10,}A = \{2, 4, 6, 8, 10, \dots \}.

  • Set B: B={nN:3n}B = \{ n \in \mathbb{N} : 3 \mid n \} — this means that BB consists of all natural numbers divisible by 3, i.e., B={3,6,9,12,15,}B = \{3, 6, 9, 12, 15, \dots \}.

  • Set C: C={nN:6n}C = \{ n \in \mathbb{N} : 6 \mid n \} — this means that CC consists of all natural numbers divisible by 6, i.e., C={6,12,18,24,}C = \{6, 12, 18, 24, \dots \}.

Now, we need to find ABA \cap B, which is the intersection of AA and BB. This intersection will include all elements that are divisible by both 2 and 3.

Since the least common multiple (LCM) of 2 and 3 is 6, ABA \cap B will consist of all natural numbers divisible by 6: AB={6,12,18,24,}A \cap B = \{6, 12, 18, 24, \dots \}

Finally, we check whether ABA \cap B is a subset of CC. Since C={6,12,18,24,}C = \{6, 12, 18, 24, \dots \} consists of all multiples of 6, and AB={6,12,18,24,}A \cap B = \{6, 12, 18, 24, \dots \} is exactly the same set, it follows that: ABCA \cap B \subseteq C

Therefore, yes, ABA \cap B is a subset of CC.


Do you want more details or have any questions?

Here are 5 related questions:

  1. What is the union of sets AA and BB in this case?
  2. How do we find the least common multiple (LCM) of two numbers?
  3. Can the intersection of two sets ever be larger than one of the original sets?
  4. What is the greatest common divisor (GCD) of 2 and 3, and how is it different from the LCM?
  5. How would the answer change if CC was {nN:12n}\{n \in \mathbb{N} : 12 \mid n \}?

Tip: When finding intersections of sets defined by divisibility, look for the least common multiple of the divisors involved!

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Set Theory
Divisibility
Intersection of Sets
Subsets

Formulas

A ∩ B = {n ∈ N : LCM(2, 3)|n}
A ∩ B ⊆ C

Theorems

Intersection of sets
Least common multiple (LCM)
Subsets theorem

Suitable Grade Level

Grades 9-12