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How many terms of the sequence (12,17,22,27,\ldots) are less than (60)?

Answer and explanation

Correct answer: 10

This is an arithmetic sequence with first term 12 and common difference 5. Its nth term is \(a_n=12+5(n-1)\). Using \(a_n<60\), we get \(12+5(n-1)<60\), so \(n<10.6\). Thus, the possible whole-number values of \(n\) are 1 through 10, giving 10 terms less than 60. The 11th term is 62, so it is not included. Exam tip: for “less than,” use the strict inequality \(<\), not \(\leq\).

Related tags

Arithmetic SequenceTerm CountingInequalitiesClass 9 MathematicsSequences And ProgressionsSequencesMathematicsClass 9 Mcq

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