यदि \(U={1,2,\ldots,30}\), \(A={x:x\in U,\ 2\mid x}\) और \(B={x:x\in U,\ 5\mid x}\) है, तो (n\(A\setminus B\)) कितना है?
If \(U={1,2,\ldots,30}\), \(A={x:x\in U,\ 2\mid x}\), and \(B={x:x\in U,\ 5\mid x}\), then what is (n\(A\setminus B\))?
Explanation opens after your attempt
Correct Answer
A. (12)
Concept
There are (15) even numbers in (A), and (3) multiples of (10). Thus (n\(A\setminus B\)=15-3=12).
Why this answer is correct
The correct answer is A. (12). There are (15) even numbers in (A), and (3) multiples of (10). Thus (n\(A\setminus B\)=15-3=12).
Exam Tip
(A) में (15) सम संख्याएं हैं और (10) के गुणज (3) हैं। इसलिए (n\(A\setminus B\)=15-3=12)।
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