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Question

Choose the missing number in the below series.
100, 95, 90, 85, ?, 75

This question was previously asked in
SSC Stenographer 2025 Question Paper (06-Aug-2025) Shift 2
The correct answer is
80

Identifying the Pattern in the Number Series

To find the missing number in the series 100, 95, 90, 85, ?, 75, we first need to identify the pattern or rule that governs the sequence.

  • Let's look at the difference between consecutive numbers:
    • From 100 to 95: The number decreases by 5. \( 100 - 5 = 95 \)
    • From 95 to 90: The number decreases by 5. \( 95 - 5 = 90 \)
    • From 90 to 85: The number decreases by 5. \( 90 - 5 = 85 \)
  • The pattern observed is that each number in the series is 5 less than the previous number.

Calculating the Missing Number

Applying this consistent pattern of subtracting 5, we can find the missing number:

  • The number before the missing one is 85.
  • To find the missing number, subtract 5 from 85: \( 85 - 5 = 80 \).

Verifying the Series

Let's check if this result fits the rest of the series:

  • If the missing number is 80, the next step would be: \( 80 - 5 = 75 \).
  • This matches the last number given in the series (75), confirming our pattern and the missing number.

Therefore, the missing number in the series is 80.

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Important Questions from Number Series

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