Question

On the real axis A=[1,5] and B=[3,9] then A-B is
[1,3)
(1,3)
[5,9)
(5,9)

Answer 1

SOLUTION

TO CHOOSE THE CORRECT OPTION

On the real axis A = [ 1 , 5 ] and B = [ 3 , 9 ] then A - B is

• [1,3)

• (1,3)

• [5,9)

• (5,9)

EVALUATION

Here it is given that On the real axis A = [1,5] and B = [3,9]

So we get -

A = [1,5]

⇒ A = { x ∈ R : 1 ≤ x ≤ 5 }

Again

B = [ 3,9]

⇒ B = { x ∈ R : 3 ≤ x ≤ 9 }

Thus we have

A - B

= { x ∈ A : x ∉ B }

= { x ∈ R : 1 ≤ x < 3 }

= [ 1 , 3 )

FINAL ANSWER

Hence the correct option is [ 1 , 3 )

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