Question:

Look at this series: \(7, 10, 8, 11, 9, 12, ......\) What number should come next?

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For number series, check alternating differences (e.g., \(+a,-b,+a,-b\)). Writing the first few differences often reveals the cycle immediately.
Updated On: Aug 14, 2025
  • 7
  • 10
  • 12
  • 13
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The Correct Option is B

Solution and Explanation

Step 1: Observe the alternating pattern.
Differences: \(+3,\, -2,\, +3,\, -2,\, +3,\, \ldots\)
That is, odd steps \(+3\), even steps \(-2\). Step 2: Apply the next step.
Last term \(=12\). The next (even) step is \(-2\): \(12-2=10\). \[ \boxed{10} \]
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