a_n=⅔n+3
a₁=3⅔
S_n=(a₁+a_n)*n/2
a₅₀=2*50/3+3
a₅₀=36⅓
s₅₀=(2⅔+36⅓)*50/2=39*25=975
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a_n=⅔n+3
a₁=3⅔
S_n=(a₁+a_n)*n/2
a₅₀=2*50/3+3
a₅₀=36⅓
s₅₀=(2⅔+36⅓)*50/2=39*25=975