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https://youtu.be/7oV7hiAsVTI?t=2999 pi_approx
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| lei[n_Integer] := | |
| Range[0, n] // | |
| 1 + 2 # & // | |
| Partition[#, 2] & // | |
| Map[1./Times @@ # &] // | |
| Total // | |
| #*8 &; | |
| lei[10000] | |
| lei2[n_Integer] := MapThread[#2 *1./#1 &, { | |
| Range[0, n] // 1 + 2*# &, | |
| Range[0, n] // (-1)^# &} | |
| ] // Total // #*4 & | |
| lei2[10000] |
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