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a₂=22
a(do n)=a₁+(n-1)r
22=4+(7-1)r
18=6r
r=3
a₁ = 4
a₂ = a₁+r = 7
a₃ = a₁+2r = 10
a₄ = a₁+3r = 13
a₅ = a₁+4r = 16
a₆ = a₁ + 5r = 19
a₇ = 22