My Question of the Day

Correct!

• Here's Why:

  The sum of the positive odd integers less than 50 is 1 + 3 + 5 + ··· + 45 + 47 + 49, and the sum of the positive even integers less than or equal to 50 is 2 + 4 + 6 + ··· + 46 + 48 + 50. When the first sum is subtracted from the second, the terms can be regrouped to form (2 – 1) + (4 – 3) + ··· + (48 – 47) + (50 – 49), which is just 1 + 1 + 1 + ··· + 1, where there are 25 ones. Therefore, the correct answer is 25.

• Difficulty: Hard
• Question Type: Standard Multiple Choice
  
  (Mathematics)

Today's Responses

• Section:
  Mathematics
• Responses:
  (Total So Far)
  187,784

• Correct: 45%
• Incorrect: 55%

Next Steps