Question: How many code symbols can be formed using 5 of the 6 letters A, B, C, D, E, F if the letters: a) Are not

How many code symbols can be formed using 5 of the 6 letters A, B, C, D, E, F if the letters:
a) Are not repeated?
b) Can be repeated?
c) Are not repeated but must begin with D?
d) Are not repeated but must begin with DE?

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