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A1=-2 d=3 an=-2+3(n-2) -2+3(n-2)=9⇒3(n-2)=11⇒n-2=3 2/3⇒n=5 2/3 -2+3(n-2)=18⇒3(n-2)=20⇒n-2=6 2/3⇒n=8 2/3 -2+3(n-2)=14⇒3(n-2)=16⇒n-2=5 1/3⇒n=7 1/3 -2+3(n-2)=7⇒3(n-2)=9⇒n-2=3⇒n=5 Членом является число 7