Apples in baskets

Determine how many apples are in baskets when in the first basket are 4 apples, and in any other is 29 apples more than the previous, and we have eight baskets.

Result

s8 =  207

Solution:

a1=4 d=29 a8=a1+d⋅ (8−1)=4+29⋅ (8−1)=207 s8=(a1+a8)/2⋅ 8=(4+207)/2⋅ 8=844=207a_{1}=4 \ \\ d=29 \ \\ a_{8}=a_{1}+d \cdot \ (8-1)=4+29 \cdot \ (8-1)=207 \ \\ s_{8}=(a_{1}+a_{8})/2 \cdot \ 8=(4+207)/2 \cdot \ 8=844=207

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