How many words contain e f as consecutive letters

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Reference no: EM131587121

Question: 1. Encrypt the message rubber baby buggy bumpers using a shift-by-15 cipher.

2. We will use the letters a,b,c,d,e, f to form words of length 4. No word can have two of the same letter.

(a) How many words can be made?

(b) How many words end in e f?

(c) How many words contain e f as consecutive letters?

(d) How many words contain both e and f, but not necessarily consecutively?

(e) How many words contain an e or an f (or both)?

Reference no: EM131587121

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