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.

Correct result:

s₈ =  207

Solution:

$$\begin{gathered} a_1=4 \\ d=29 \\ {a}_8=a_1+d\cdot (8-1)=4+29\cdot (8-1)=207 \\ {s}_8=(a_1+a_8)\mathrm{/}2\cdot 8=(4+207)\mathrm{/}2\cdot 8=844=207 \end{gathered}$$

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