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In how many ways 6 pens can be selected from 15 identical black pens?(a) 9*3!(b) 21(c) 14!(d) 1I got this question during an internship interview.My doubt stems from Counting topic in portion Counting of Discrete Mathematics |
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Answer» CORRECT choice is (d) 1 To ELABORATE: Here the pens are IDENTICAL, the total number of ways of SELECTING 6 pens is 1. |
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