P0tential
P0tential
18-05-2018
Mathematics
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mkryukova19
mkryukova19
18-05-2018
This is an arithmetic series,
so
S(n) = (n/2)*(a(1)+a(n))
S(25) = (25/2)*(a(1)+a(25))
n=25
a(n) = 3n-2
a(1)= 3*1-2=1
a(1)=1
a(25) = 3*25-2=75-2=73
a(25)=73
S(25)
= (25/2)*(1+73)=(25/2)*74=
925
S(25)=925
Answer : 925
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