Part 1 what was the beginning, now we have to ask ourself " Is there something before the beginning ? "!
We saw in
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You can use this formula :
5 n
Now we can apply the formula
5 − 1 5 0 5 1 5 2 5 3 ↓ ↓ ↓ ↓ ↓ 0 . 2 1 5 2 5 1 2 5