How many code words of length three using the letters

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How many code words of length three using the letters { a, c, d, e, f, h } are possible? A code word of length three is any arrangement of three letters, repetitions allowed. For example: ''aac'' is a code word of length three.

A: 172.8000 B: 216 C: 270 D: 337.5000 E: 421.8750 F: 527.3438 G: 659.1797 H: 823.9746

How many code words of length three are possible using the letters { a, c, d, e, f, h }, if we insist that each letter ''d'' (unless it is the last letter) must be followed by the letter ''c''? A code word of length three is any arrangement of three letters, repetitions allowed.

A: 52.8107 B: 76.5755 C: 111.0345 D: 161 E: 233.4500 F: 338.5025 G: 490.8286 H: 711.701

Reference no: EM13867719

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