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The sum of odd numbers from 10 to 60 is

  • 13/2

  • 12/4

  • 921

  • 875

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Sum to first n odd numbers {(59+1) /2}², because last odd number is 59. After solving above equation we got 900. And sum to odd number 1 to 10 {(9+1) /2}² = 25 , hence 900-25 = 875

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