यदि \(A={x:x\) (50) से छोटे (10) के धनात्मक गुणज हैं(}) तो (A) के उचित उपसमुच्चयों की संख्या क्या है?

If \(A={x:x\) is a positive multiple of (10) less than (50)(}), how many proper subsets does (A) have?

Explanation opens after your attempt
Correct Answer

B. (15)

Step 1

Concept

\(A=\{10,20,30,40\}\) has (4) elements. Proper subsets are \(2^4-1=15\).

Step 2

Why this answer is correct

The correct answer is B. (15). \(A=\{10,20,30,40\}\) has (4) elements. Proper subsets are \(2^4-1=15\).

Step 3

Exam Tip

\(A=\{10,20,30,40\}\) में (4) अवयव हैं। उचित उपसमुच्चय \(2^4-1=15\) होते हैं।

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Mathematics Answer, Explanation and Revision Hints

यदि \(A={x:x\) (50) से छोटे (10) के धनात्मक गुणज हैं(}) तो (A) के उचित उपसमुच्चयों की संख्या क्या है? / If \(A={x:x\) is a positive multiple of (10) less than (50)(}), how many proper subsets does (A) have?

Correct Answer: B. (15). Explanation: \(A=\{10,20,30,40\}\) में (4) अवयव हैं। उचित उपसमुच्चय \(2^4-1=15\) होते हैं। / \(A=\{10,20,30,40\}\) has (4) elements. Proper subsets are \(2^4-1=15\).

Which concept should I revise for this Mathematics MCQ?

\(A=\{10,20,30,40\}\) has (4) elements. Proper subsets are \(2^4-1=15\).

What exam hint can help solve this Mathematics question?

\(A=\{10,20,30,40\}\) में (4) अवयव हैं। उचित उपसमुच्चय \(2^4-1=15\) होते हैं।