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สงวนลิขสิทธิ์ 2548 สุรเดช จิตประไพกุลศาล

Homework 9 (Due 22 August 2005)

1. Write a function, sumEveryOther, to calculate the sum of every other number in a list of numbers.
2. Write a function, firstPosition, to find the position of the first occurrence of a number in a list of numbers.
3. Write a function, allPosition, to get the list of positions of a number in a list of numbers.