Question:medium

Find the missing number in the following numerical series:
4, 11, 25, 53, ?, 221

Show Hint

Number series with rapid, near-doubling growth are often governed by a pattern of $x_n = 2 \cdot x_{n-1} \pm c$.
Checking the difference between the double of a term and the next term immediately reveals the constant value $c = 3$.
Updated On: Jul 18, 2026
  • 109
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  • 141
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Show Solution

The Correct Option is A

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