The average of first 120 odd natural numbers, is:

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RPF Constable 2024 Official Paper (Held On 03 Mar, 2025 Shift 2)
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  1. 121
  2. 120
  3. 120.5
  4. 119.5

Answer (Detailed Solution Below)

Option 2 : 120
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RPF Constable Full Test 1
120 Qs. 120 Marks 90 Mins

Detailed Solution

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Given:

The first 120 odd natural numbers.

Formula Used:

Average of n odd natural numbers = (Sum of n odd numbers) / n

Sum of first n odd natural numbers = n2

Calculation:

Here, n = 120

Sum of first 120 odd natural numbers = 1202

⇒ Sum = 120 × 120 = 14400

Average = Sum / n

⇒ Average = 14400 / 120

⇒ Average = 120

The average of the first 120 odd natural numbers is 120.

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