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Which (a_n) rule is correct for (4,11,18,25,\ldots)?

Answer and explanation

Correct answer: \(a_n=7n-3\)

This is an arithmetic sequence because the difference between consecutive terms is 7. Thus, \(a_n=a+(n-1)d=4+(n-1)\times7=7n-3\). Therefore, option A is correct. In option B, putting \(n=1\) gives the first term as 11, not 4. Exam tip: Check a proposed rule by substituting \(n=1\) and then \(n=2\).

Related tags

SequencesArithmetic SequenceNth TermLinear RuleClass 9 MathematicsSequences And ProgressionsMathematicsClass 9 Mcq

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