(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
Correct Answer

C. (127)

Step 1

Concept

Total subsets are \(2^7\), and the empty selection is removed. Hence the ways are \(2^7-1=127\).

Step 2

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 \(2^7-1=127\).

Step 3

Exam Tip

कुल उपसमुच्चय \(2^7\) हैं और खाली चयन हटेगा। इसलिए \(2^7-1=127\) तरीके हैं।

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Mathematics Answer, Explanation and Revision Hints

(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?

Correct Answer: C. (127). Explanation: कुल उपसमुच्चय \(2^7\) हैं और खाली चयन हटेगा। इसलिए \(2^7-1=127\) तरीके हैं। / Total subsets are \(2^7\), and the empty selection is removed. Hence the ways are \(2^7-1=127\).

Which concept should I revise for this Mathematics MCQ?

Total subsets are \(2^7\), and the empty selection is removed. Hence the ways are \(2^7-1=127\).

What exam hint can help solve this Mathematics question?

कुल उपसमुच्चय \(2^7\) हैं और खाली चयन हटेगा। इसलिए \(2^7-1=127\) तरीके हैं।