If $A= \{2,3,5\}$ and U be the set of pr

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Target Exam

CUET

Subject

Mathematics

Chapter

Sets

Question:

If $A= \{2,3,5\}$ and U be the set of prime factors of 210 then find A’.

Options:

$\{2,3,5\}$

$\{2,3,5,7\}$

$\{7\}$

$\phi$

Correct Answer:

$\{7\}$

Explanation:

The correct answer is Option (3) → $\{7\}$

$210=2*3*5*7 ⇒ U = \{2,3,5,7\}$.

Complement of a set A is a set which contains elements of U which are not the elements of A.

So, $A’=U-A=\{2,3,5,7\} – \{2,3,5\} = \{7\}$.