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| =Additional Information= | | =Additional Information= |
| ==Useful websites== | | ==Useful websites== |
− | permutation and combination [http://www.mathsisfun.com/combinatorics/combinations-permutations.html]
| + | #[http://www.mathsisfun.com/combinatorics/combinations-permutations.html Permutation and combination] |
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| + | Useful video from khan academy |
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| + | {{#widget:YouTube|id=oQpKtm5TtxU}} |
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| ==Reference Books== | | ==Reference Books== |