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հանրահաշիվ

S5+3a11=8

a11=8

S5=a2+a5/2=5

a1+a5/2*5

16a1+80d=16

16(a1+5d)=16

a6=1

sn=a1+an/2*n=a1++a1+(n-1)/2*d

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