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if nPr = 720 and nCr = 6, then find value of r! ?1. 5!2. 4!3. 3!4. 2! |
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Answer» Correct Answer - Option 1 : 5! Formula Used: nPr =n!/(n-r)! nCr = n!/[(n-r)! r! ] nPr/nCr = r! Calculation: Given: nPr = 720 nCr = 6 nPr/nCr = r! r! = 720/6 r! = 120 r! = 5 × 4 × 3 × 2 × 1 r = 5 ∴ The value of r! = 5! |
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