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Marrrta [24]
3 years ago
10

Help please 30 points!!

Mathematics
1 answer:
JulijaS [17]3 years ago
6 0

Answer:

50

Step-by-step explanation:

50 -10=40-10+20=50

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Explanation:

A shortcut way is to start at 15 and count down til you reach three values. So that means you'll have 15, 14, 13 which multiplies out to...

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Or you can use the nPr formula, with n = 15 and r = 2, to get the same answer

nPr = (n!)/((n-r)!)
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