Question: How many code symbols can be formed using 5 out of 6 of the letters of G, H, I, J, K, L if the letters:

How many code symbols can be formed using 5 out of 6 of the letters of G, H, I, J,
K, L if the letters:
a) Cannot be repeated? [8.5]
b) Can be repeated? [8.5]
c) Cannot be repeated but must begin with K? [8.5]
d) Cannot be repeated but must end with IGH?[8.5]

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