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lafaierty
@lafaierty
March 2022
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(FURG-RS) Determine o valor de n
que satisfaz a equação: An-1, 3 : An, 3 = 3/4
a) 4
b) 5
c) 11
d) 12
e) 13
No gabarito aparece a alternativa C como correta, mas a minha conta bateu com a letra B. Vejam:
(n-1).(n-2).(n-3)
----------------- = 3/4
n.(n-1).(n-2)
(n-3) : n = 3/ 4
4.(n-3) : n = 3
4n - 12 -3 : n = 0
4n -15 = n
4n - n - 15 = 0
3n - 15 = 0
3n = 15
n = 15/3
n = 5
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(TRIGONOMETRIA) Me ajudem???!! Expliquem passo a passo pfvr.
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