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USPshnik [31]
3 years ago
9

PLEASE HELP ME!! BRAINLIEST!!

Mathematics
1 answer:
-Dominant- [34]3 years ago
8 0

Answer:

200

Step-by-step explanation:

Given the first term 39 and the last term 11 then the sum of the 8 layers can be calculated as

S_{n} = \frac{n}{2} ( f + l) ← f is the bottom layer anf f the top layer, thus

S_{8} = \frac{8}{2} (39 + 11) = 4 × 50 = 200

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