Question:medium

The sum of the first n numbers, is 1275. The value of n is equal to

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To solve $n(n+1) = X$ quickly, take the square root of $X$. The integer part of the square root will usually be your $n$. \[ \sqrt{2550} \approx 50.4 \rightarrow n = 50 \]
Updated On: Jul 6, 2026
  • 50
  • 45
  • 55
  • 60
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The Correct Option is A

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