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## Henry Bushby Transcription pages

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N^{3}/_{2}^{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, 2^{y}]

__Notes on Knots. Vol 4.__

__HNGB.__

Ap. 1902.