Exercises 4-4 1. Zip Codes How many 5-digit zip codes are possible if digits can be repeated? If there cannot be repetitions? 2. Letter Permutations List all the permutations of the letters in the word MATH. 3. Speaking Order Seven elementary students are se- lected to give a 3-minute presentation on what they did during summer vacation. How many different ways can the speakers be arranged?

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A: we know thatno.of letters (A to Z)=26no.of digits(0 to 1)=10

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Q: 5. How many triangles can you make using 6 non collinear points on a plane?

A: Solution #5 Number of Triangles= 20

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A: In general, the number of letters from A to Z is 26 and the number of digits from 0 to 9 is 10.

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