ELI5: Explain Like I'm 5

Bell series

A bell series is like a game where you take a really big number and add up some smaller and smaller numbers to get closer and closer to the big number.

Imagine you have a jar with 10 blueberries in it. You want to count how many blueberries there are, but you want to do it in a fun way. So, you decide to start with one blueberry and then keep adding more blueberries until you have counted all 10.

First, you count one blueberry. Then, you add another blueberry and count two blueberries. Next, you add another blueberry and count three blueberries. You keep doing this until you have counted all 10 blueberries.

This is like a bell series because you start with a small number and add bigger and bigger numbers to get to a bigger number, just like adding one blueberry at a time until you get to 10 blueberries. It's a fun way to count big numbers!
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