(7) रंगीन पेंसिलों में से कम से कम (1) पेंसिल चुनने के कितने तरीके हैं?
In how many ways can at least (1) pencil be selected from (7) colored pencils?
Explanation opens after your attempt
C. (127)
Concept
Total subsets are \(2^7\), and the empty selection is removed. Hence the ways are \(2^7-1=127\).
Why this answer is correct
The correct answer is C. (127). Total subsets are \(2^7\), and the empty selection is removed. Hence the ways are \(2^7-1=127\).
Exam Tip
कुल उपसमुच्चय \(2^7\) हैं और खाली चयन हटेगा। इसलिए \(2^7-1=127\) तरीके हैं।
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