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1/3 [?] 1=1 s.2
Combinations of n things r at a time are
[Fomula: |n / |r |(n-r)] [In modern mathematical notation this would be
n!/r!(n-r)! where n! = nx(n-1)x(n-2).... e.g. 5! = 5x4x3x2x1 = 120]
[Bracket spanning 3 lines:] Permutations n things r at a time are
n(n-1)(n-2) . . . (n-r+1)
[No of Permutations = n!/(n-r)!]
Permutations of n things all together are [n?] [n!]
Possibilities of y crossings 2^y. [2 to the power y, 2y]
Notes on Knots. Vol 4.
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