Question: 2.14. From the letters a, b, c, d, e, and f how many 4-letter code words may be formed if, (a) no letter may be

2.14. From the letters

a, b,

c, d,

e, and f how many 4-letter code words may be formed if,

(a) no letter may be repeated?

(b) any letter may be repeated any number of times?

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