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AS Maths (Probability (Binomial (Distributions, Expansions), Perms (Box…
AS Maths
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Vectors
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In writing vectors can be displayed like \(\xrightarrow[AB]{}\) or \(\xrightarrow[]{AB}\) or AB with a squiggle underneath or \(\vec {AB}\)
A Basic Truth is important. \(\vec {AB} + \vec {BC} = \vec {AC}\) and \(\vec {AC} + \vec {BC} = \vec {AB}\)
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Number
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Sequences
Arithmetic
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Sum of a given set of points \(S_n=\frac{1}{2}*n*(t_1+t_n)\) Where \(t_1\) is the value of the first term, and \(t_n\) is the value of the nth term
Geometric
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The sum of all the given points in a set, \(S_n=\frac{a(a-r^n)}{1-r}\) so long as \(r \neq 1\). If \(r=1\) then just use \(S_n=na\)
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