यदि (n) वस्तुओं में से कम से कम (1) वस्तु चुननी हो, तो कुल चयन \(2^n-1\) क्यों होते हैं?
If at least (1) object must be selected from (n) objects, why are the total selections \(2^n-1\)?
Explanation opens after your attempt
A. क्योंकि प्रत्येक वस्तु के लिए चुनना या न चुनना दो विकल्प हैं और खाली चयन हटाया जाता हैBecause each object has two choices, select or not select, and the empty selection is removed
Concept
Each object has two independent choices, so total subsets are \(2^n\), and for at least (1) the empty set is removed. In exams use total minus unwanted for at least conditions.
Why this answer is correct
The correct answer is A. क्योंकि प्रत्येक वस्तु के लिए चुनना या न चुनना दो विकल्प हैं और खाली चयन हटाया जाता है / Because each object has two choices, select or not select, and the empty selection is removed. Each object has two independent choices, so total subsets are \(2^n\), and for at least (1) the empty set is removed. In exams use total minus unwanted for at least conditions.
Exam Tip
हर वस्तु के लिए दो स्वतंत्र विकल्प होने से कुल subsets \(2^n\) होते हैं, और कम से कम (1) के लिए empty set हटता है। परीक्षा में at least condition में total minus unwanted सोचें।
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