यदि \(A={x:x\in\mathbb{N},\ x\le15,\ 2\mid x}\) और \(B={x:x\in\mathbb{N},\ x\le15,\ 5\mid x}\), तो \(A\cup B\) में कितने तत्व हैं?
If \(A={x:x\in\mathbb{N},\ x\le15,\ 2\mid x}\) and \(B={x:x\in\mathbb{N},\ x\le15,\ 5\mid x}\), how many elements are in \(A\cup B\)?
Explanation opens after your attempt
A. (9)
Concept
(A) has (7) elements, (B) has (3), and the common set is ({10}), so the count is (7+3-1=9). Do not count common elements twice.
Why this answer is correct
The correct answer is A. (9). (A) has (7) elements, (B) has (3), and the common set is ({10}), so the count is (7+3-1=9). Do not count common elements twice.
Exam Tip
(A) में (7), (B) में (3) और साझा ({10}) है, इसलिए संख्या (7+3-1=9) है। साझा तत्व दो बार न गिनें।
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