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What is the general term of the sequence (1,15,63,195,\ldots)?

Answer and explanation

Correct answer: The general term cannot be determined uniquely from the given finite information.

With only four given terms, the general term of a sequence is not uniquely determined. For example, the polynomial in option C gives \(1,15,63,195\) for \(n=1,2,3,4\), but many other rules can also produce these same four terms. Option A fits only the first two terms; at \(n=3\), it gives \(53\), not \(63\). Exam tip: Test a proposed rule against every listed term and check whether enough information is available to define a unique pattern.

Related tags

SequencesExplicit RulePolynomial SequenceFinite DifferencesPattern RecognitionExplicit Or General RuleSequences And ProgressionsMathematics

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