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(a₁+a₃)/2=a₂
(1+x-11)/2=3
(-10+x)/2=3 /*2
-10+x=6
x=6+10
x=16
Z własności ciągu:
a3-a2=a2-a1
x-11-3=3-1
x-14=2
x=2+14
x=16 , C