September 2018 1 8 Report
Uzupełnij brakujące liczby wiedząc, że ciąg {an} jest arytmetyczny

a)
a₁ = 3
r = 2
n = 20
an = ?

b)
a₁ = 63
r = -2⅓
an = 28
n = ?

c)
r = 8
n = 15
an = -88
a₁ = ?

d)
a₁ = 0,5
n = 21
an = 10,5
r = ?

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