what is the answer for the circled one with correct steps
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A=5
d=2
an=a +(n-1)d
l=39
a=5
39=5+[n-1]2
n=18
Sn=n/2(@+l)
sn=9(5^2+39^2)
sn=9(25+1521)
=9*1546
Sn=13914 @ns
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