# Math / Science

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The Math / Science topic primarily includes discussions of mathematics, physics, statistics and economic analysis, but also biology, chemistry and other sciences.

I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below.

https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt
https://filedb.experts-exchange.com/incoming/2017/03_w12/1152429/Combinations.txt
https://filedb.experts-exchange.com/incoming/2017/03_w12/1152430/Perms-Combs.xlsm

## 1. I've attached the XLSM Excel spreadsheet I used in the video

Please use the example files I have attached.Permutations.txt
Combinations.txt
Perms-Combs.xlsm
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Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11).
The larger templates are marginally faster (4 - 6%) but at great expense: 100's or 1000's of lines of code.

The macro assigned to my "Find Primes" button is listed below:

Option Explicit

Public i As Long
Public j As Long
Public estr As Double
Public esti As Long              ' used with estr to estimate the size of the primes array
Public iend As Long            ' user input - program will enumerate all prime <= iend
Public sr As Long                 ' square root of iend
Public PrX() As Boolean      ' Templated Possible Primes
Public Primes() As Long      ' # Primes <= iend

Sub DefinePrimes()

With ThisWorkbook.Worksheets("Sheet1")   ' rename the sheet if needed
iend = .Cells(1, 5)
If iend < 40 Then
iend = 40
End If

estr = 1 / (WorksheetFunction.Ln(iend) - 1.15)
esti = Int(estr * iend)
ReDim PrX(iend + 30)           ' we always want to have a little extra space
ReDim Primes(esti)               ' we always want to have a little extra space
sr = Sqr(iend)
.Cells(1, 4) = "Find Primes <= "
.Cells(1, 5) = iend
.Cells(2, 4) = "estr ="
.Cells(2, 5) = estr
.Cells(3, 4) = "esti ="
.Cells(3, 5) = esti
.Cells(4, 4) = "sr ="
.Cells(4, 5) = sr
PrX(2) = True
PrX(3) = True
…
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Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac Newton by several years in publishing his work. Actually, it was Jacob's brother Johann Bernoulli (1667-1748), an academic who made sense of Leibniz's notes and was primarily responsible for getting Leibniz's "Calculus" published. In fact, it was Johann that coined the term "Integral" (Leibniz called it sums), and may have even been responsible for the calculus symbology. If the name Bernoulli sounds familiar and you're an engineer, it's probably Johann's son Daniel Bernoulli you recall.

For over 300 years, mathematicians and statisticians have used the Binomial Distribution to group and model real world observations and is the basis of many other statistical distributions.

Here are my spreadsheets if you want to take a look at them:
https://filedb.experts-exchange.com/incoming/2017/03_w13/1153243/N-16-BBD.xlsm
https://filedb.experts-exchange.com/incoming/2017/03_w13/1153244/N-35-BBD.xlsm
https://filedb.experts-exchange.com/incoming/2017/03_w13/1153245/N-40-BBD.xlsm
https://filedb.experts-exchange.com/incoming/2017/03_w13/1153246/N-64-BBD.xlsm
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This is a video describing the growing solar energy use in Utah. This is a topic that greatly interests me and so I decided to produce a video about it.
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# Math / Science

9K

Solutions

6K

Contributors

The Math / Science topic primarily includes discussions of mathematics, physics, statistics and economic analysis, but also biology, chemistry and other sciences.