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Question
If 10Pr = 5040, Find the value of r.
Options
5
6
3
4
MCQ
Solution
4
Explanation:
10Pr = 5040
⇒ `(10!)/((10 - r)!)` = 5040
⇒ `(10 xx 9 xx 8 xx 7 xx 6!)/((10 - r)!)` = 5040
⇒ `(5040 xx 6!)/((10 - r)!)` = 5040
⇒ 6! = (10 – r)!
∴ r = 4
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Probability (Entrance Exam)
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