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1° DÍA: 15
2° DÍA: 20
3° DÍA: 25
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21° DÍA: ?
LUEGO:
a₂₁ = a₁ + 20d (d = razón = 5)
a₂₁ = 15 + 20 (5)
a₂₁ = 115 Minutos
ESO ES TODO, SALUDOS.................
tn = x
n = 21 = 3 semanas
r = 5
tn = t1 + (n-1)r
tn = 15 + (21-1)(5)
tn = 15 + 20(5)
tn = 15 + 100
tn = 115
el Ultimo dia nada 115 minutos