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a₂ = a₁·q⇒ a₁ = a₂ : q
a₁ = 5/2 : 1/2= 5/2 ·2= 5
a₃ =a₂ ·q = 5/2· 1/2= 5/4
a₄ =a₃· q= 5/4 ·1/2 = 5/8
a₅= a₄·q= 5/8· 1/2 =5/16