Розв'язання:
(an) a₁ = 6,
d = -4
an = a₁+(n-1)d
a₅ = a₁+4d
a₅ = 6+(-4·4) = 6-16 = -10.
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Розв'язання:
(an) a₁ = 6,
d = -4
an = a₁+(n-1)d
a₅ = a₁+4d
a₅ = 6+(-4·4) = 6-16 = -10.