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CAT 2002 | Question: 77

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A student finds the sum $1 + 2 + 3 + \dots $ as his patience runs out. He found the sum as $575.$ When the teacher declared the result wrong, the student realized that he missed a number. What was the number the student missed?

  1. $16$
  2. $18$
  3. $14$
  4. $20$

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