Question

what is the answer for the circled one with correct steps

Answer 1

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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