   Chapter 1.7, Problem 25E

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# Let £ = { 1 , 2 , 3 } , A 1 = { a , b , c , d } ,   A 2 = { c , d , e , f } , and A 3 = { a , c , f , g } . Write out ∪ λ ∈ £ A λ and ∩ λ ∈ £ A λ .

To determine

The sets λ£Aλ and λ£Aλ.

Explanation

Given Information:

The given sets are,

£={1,2,3}, A1={a,b,c,d},A2={c,d,e,f}, and A3={a,c,f,g}.

Formula Used:

λ£Aλ={x|xAλforatleastoneλ£}

And, λLAλ={x|xAλforeveryλ£}

Explanation:

Consider the given information.

£={1,2,3}, A1={a,b,c,d},A2={c,d,e,f}, and A3={a,c,f,g}.

Let us calculate λ£Aλ

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