[tex]a_2=a_1-1\\a_3=a_2-2\\a_4=a_3-3\\...\\a_8=a_7-7[/tex] gelir. Taraf tarafa toplarsak bazı ifadelerin birbirini götürdüğünü fark edeceksin ve son sonuç;
[tex]a_8=a_1-1-2-3-4-5-6-7=40-1-2-3-4-5-6-7=12[/tex] olur.
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