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Permutations and combinations! Urgent! if nPr=6720 and nCr=56 what is r? if nPr=56 and nCr=6720 what is r?
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5 votes
Permutations and combinations! Urgent!

if nPr=6720 and nCr=56 what is r?
if nPr=56 and nCr=6720 what is r?

User Sugey
by
7.6k points

2 Answers

5 votes
nPr = 6720

nCr = 56

we know

nCr = nPr/ r ! = 56

6720/r! = 56

r! = 6720/56 = 120

r! = 5×4×3×2×1= 5!

so r = 5


for 2nd part
its not possible because

nPr > nCr
User Kravi
by
8.5k points
6 votes

Answer:

Step-by-step explanation: i

Am

Sorry

I

Dont

Know

User Ruben Aguilar
by
8.3k points
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