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**[Math]**
- Number of digits in a number ~ log(x) + 1
- Number of digits in factorial n! = log(n) + log(n-1) + ... + log(1) + 1 (log base 10 in C is log10(double).
- (n choose k) = product (i = 1 to k) {(n - k + i) / i} (530 - Binomial showdown)
- (n choose k) = (n choose n-k) (530 - Binomial showdown)

**[R] **
- Uninstall R Completely from your Mac OS X

**[Linear Algebra]**
**[Python]**
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