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Elina [12.6K]
3 years ago
14

Aight I think I just figured out this pyramidal sequence thing. You're going up by perfect numbers right, like 4, 9, 16, 25. Bec

ause all of those are square numbers right? The 4 would be 2, 9 and 3, 16 and 4, 25 and 5... Right? Sorry if I confused you, I have to take my finals plus two other tests tomorrow so I have to go back and re-learn everything(or you know just actually learning it for the first time).
Mathematics
1 answer:
muminat3 years ago
4 0

Answer:  Close.  Your observation is correct. When you see that the difference between two numbers in the sequence is a perfect square, you are looking at a pyramidal sequence

1² = <u>1 </u> top of pyramid

1 + 2² = <u>5</u>   total in top 2 layers

1 + 2² + 3² = <u>14</u> total in top 3 layers

1 + 2² + 3² + 4² = <u>30</u> total in the top 4 layers.

1 + 2² + 3² + 4² + 5² = <u>55</u>  total in the top 5 layers.

Layer 6 is 6² more, 91

Layer 7 is 7² more so, 140

I think you got it.

Step-by-step explanation:  The numbers are like when you keep adding the layers in a pyramid, and the next number is the total of the previous layers plus the square of the next layer number.

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