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guajiro [1.7K]
3 years ago
11

Can anyone plz explain the permutation formula in math? and plz make it simple because I'm just a 7th grade student​

Mathematics
1 answer:
mixas84 [53]3 years ago
7 0

Answer:

To calculate permutations, we use the equation nPr, where n is the total number of choices and r is the amount of items being selected. To solve this equation, use the equation nPr = n! / (n - r)!.

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A flagpole broke in a storm. It was originally 81 feet tall. 28 feet are still sticking straight out of the ground, where it sna
Nina [5.8K]
Hidden right triangle
28 feet tall (1 leg)
the piece that fell over is the hypotonuse
last leg is what we need to find

81-28=53


a²+b²=c²
a and b are legs and c is the hypotonuse

given
on leg is 28 and the hypotonuse is 53
th othe leg is b
28²+b²=53²
784+b²=2809
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sqrt both sides
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4 0
3 years ago
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Lisa has twelve fewer dimes than quarters, for a total of $11.05
SVEN [57.7K]
So set up the equations
q-12=d
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plug in q-12 as d in the second equation:
25q+10q-120=1105, then simplify:
35q=1225
q=35
since there's 12 fewer dimes, we know that there's 23 dimes and 35 quarters.
5 0
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