OCR MEI S1 2008 January — Question 2

Exam BoardOCR MEI
ModuleS1 (Statistics 1)
Year2008
SessionJanuary
TopicPermutations & Arrangements
TypeCode/password formation
2 Codes of three letters are made up using only the letters A, C, T, G. Find how many different codes are possible
  1. if all three letters used must be different,
  2. if letters may be repeated.
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