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10-05-2016
Mathematics

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How many different 4 letter arrangements can be formed from the letters in the word cards

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apologiabiology apologiabiology

10-05-2016

slot method
1st slot, 5 options
2nd slot, 4 options (1 gone to the first slot)
3rd slot, 3 options (1 gone again)
4th slot,2 options (1 less)

multiply
5*4*3*2=120

answer is 120 arrangements

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