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What will be the next term in the sequence (9,21,39,63,93,\ldots)?

Answer and explanation

Correct answer: 129

The differences between consecutive terms are \(21-9=12\), \(39-21=18\), \(63-39=24\), and \(93-63=30\). These differences increase by \(6\) each time, so the next difference is \(36\). Therefore, the next term is \(93+36=129\). Option 123 would result if the difference remained 30, but the pattern shows that it continues increasing. Exam tip: For such sequences, list the first and second differences to identify the pattern.

Related tags

SequencesNumber PatternsSuccessive DifferencesNext TermClass 9 MathematicsSequences And ProgressionsMathematicsClass 9 Mcq

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