SOLUTION: If nPr= 55400 and nCr=462, determine r.
-> SOLUTION: If nPr= 55400 and nCr=462, determine r.
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If nPr= 55400 and nCr=462, determine r.
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I think you may have typoed and put 55400 instead of 55440 (simply because 55400/462 is not an integer, as you will see).
For this problem, we can note that
. Since r! = 120, r = 5.