Complete the following. (a) Calculate how many numbers between 100 and 699 contain exactly one 1 by subtracting the number that contain no 1's, two 1's, or three 1's from the total. (b) Calculate the answer to part (a) directly by creating a tree diagram and considering whether the first digit is a 1 or not, then the second digit, and then the third. (a) There are numbers between 100 and 699 that contain exactly one 1. (Type a whole number.)

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