(7) अलग-अलग पेंसिलों में से (2) पेंसिलों को पहले और दूसरे डिब्बे में रखने के तरीके कितने हैं?
How many ways are there to place (2) pencils from (7) different pencils in the first and second boxes?
Explanation opens after your attempt
A. (42)
Concept
There are (7) choices for the first box and (6) for the second, so (42). Permutation is counted for distinct boxes.
Why this answer is correct
The correct answer is A. (42). There are (7) choices for the first box and (6) for the second, so (42). Permutation is counted for distinct boxes.
Exam Tip
पहले डिब्बे के लिए (7) और दूसरे के लिए (6) विकल्प हैं इसलिए (42)। अलग डिब्बों में क्रमचय गिना जाता है।
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