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(a) What is the sum of all the odd integers between 1 and 400 (b) In an arithmetic series, the first number is 12 and the last number is 138

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(a) What is the sum of all the odd integers between 1 and 400 (b) In an arithmetic series, the first number is 12
and the last number is 138. If the sum of the numbers is 1125, how many numbers are in this series?