Question

Let A = {n ℤ | n = 5r for some integer r} and B = {m ℤ | m = 20s for some integer s}. Determine which of the following statements are true and which are false. (Enter TRUE if the statement is true, and enter a number that could be used as the basis for a counterexample if the statement is false).

Answer 1

Answer:

Incomplete question

This is the complete aspect of the question

a. Is this true or false

A⊆B?

b. Is this true or false

B⊆A?

Step-by-step explanation:

Given that

A = {n ℤ | n = 5r for some integer r}

Integer are positive and negative whole numbers

A={...-20,-15,-10,-5,0,5,10,15,20...}

Also,

B ={mℤ |m = 20s for some integer s}.

Then,

B={....-80,-40,-20,0,20,40,80....}

a. In mathematics, a set A is contained in B if every element in A is found in B

Then,

A⊆B

Then looking at A and B, not all element in A can be found in B e.g, 10, 15,25,-10,-25 and so, the law doesn't hold

Then, A⊆B is false

b. B⊆A, now every element in B can be found in A, then this is true and then B is contain in A