an=a1+(n-1)d
a1=6; d=2,5
n=11
a11=6+(11-1)×2,5
a11=6+10×2,5
a11=6+25
a11=31
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an=a1+(n-1)d
a1=6; d=2,5
n=11
a11=6+(11-1)×2,5
a11=6+10×2,5
a11=6+25
a11=31