पहिल्या 57 नैसर्गिक संख्यांची सरासरी किती आहे?

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SSC MTS (2022) Official Paper (Held On: 11 May, 2023 Shift 1)
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  1. 35
  2. 29
  3. 42
  4. 40.5

Answer (Detailed Solution Below)

Option 2 : 29
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वापरलेले सूत्र:

पहिल्या n नैसर्गिक संख्यांची बेरीज = n(n + 1)/2

गणना:

पहिल्या 57 नैसर्गिक संख्येची बेरीज = 57(57 + 1)/2 = 57 × 58/2 = 1653

सरासरी = 1653/57 = 29

∴ बरोबर उत्तर 29 आहे.

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