Let an be an AP for which a2+a3+a4=54 find a3
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a+d+a+2d+a+3d=54
3a+6d=54
3(a+2d)=54
a+2d=54/3
a+2d=18
a3=18
3a+6d=54
3(a+2d)=54
a+2d=54/3
a+2d=18
a3=18
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