A=_18.9 d =2.5 An =3.6 n =
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an=a+(n-1)*d
3.6=18.9(n-1)*2.5
3.6=18.9(2.5n-2.5)
3.6=18.9-2.5(2.5n)
3.6=-----------
an=a+(n-1)*d
3.6=18.9(n-1)*2.5
3.6=18.9(2.5n-2.5)
3.6=18.9-2.5(2.5n)
3.6=-----------
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