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F0x
@F0x
January 2020
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Determine o 20° termo de cada sequência
a) (4,7,10,13...)
b) (3,1,-1,-3,-5)
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marinalva24
A) 61 a sequência é de três em três) b) - 37 a sequência é de dois em dois
2 votes
Thanks 1
lindsaycyrus
A) a20= ?
n=20
a1=4
r=3
an=a1 +(n-1).r
a20=4 +(20-1).3
a20=4+19.3
a20=4+57
a20=61
b)a20=?
n=20
a1=3
r=-2
an=a1+(n-1).r
a20=3+(20-1). -2
a20=3+19. -2
a20=3-38
a20=-35
4 votes
Thanks 6
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n=20
a1=4
r=3
an=a1 +(n-1).r
a20=4 +(20-1).3
a20=4+19.3
a20=4+57
a20=61
b)a20=?
n=20
a1=3
r=-2
an=a1+(n-1).r
a20=3+(20-1). -2
a20=3+19. -2
a20=3-38
a20=-35