Między liczby 4 i 22 wstaw pięć liczb tak, aby wraz z danymi liczbami tworzyły ciąg arytmetyczny .
4 i 22
4 - a₁
22 - a₇
a₇ = a₁+6r
22 = 4+6r
18 = 6r /:6
r = 3
a₂ = 4+3 = 7
a₃ = 7+3 = 10
a₄ = 10+3 = 13
a₅ = 13+3 = 16
a₆ = 16+3 = 19
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4 i 22
4 - a₁
22 - a₇
a₇ = a₁+6r
22 = 4+6r
18 = 6r /:6
r = 3
a₂ = 4+3 = 7
a₃ = 7+3 = 10
a₄ = 10+3 = 13
a₅ = 13+3 = 16
a₆ = 16+3 = 19