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In the AP (7,12,17,\ldots), what is the last term less than (180)?

Answer and explanation

Correct answer: 177

Here, the first term is 7 and the common difference is 5. The nth term is \(a_n=7+5(n-1)\). From \(7+5(n-1)<180\), we get \(n<35.6\), so the greatest integer value of n is 35. Thus, \(a_{35}=7+5(34)=177\). The next term is 182, which is not less than 180. Although 179 is less than 180, it is not a term of this AP. Exam tip: For a “last term less than” question, solve the inequality and take the greatest possible integer value of n.

Related tags

Arithmetic ProgressionNth TermInequalitiesLast TermClass 10 MathematicsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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