an=a1+d(n-1)
d(n-1)=an-a1
d=(an-a1)/(n-1)
d=(418+2)/(16-1)
d=28
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an=a1+d(n-1)
d(n-1)=an-a1
d=(an-a1)/(n-1)
d=(418+2)/(16-1)
d=28