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In the AP (2,6,10,\ldots), what is the last term less than (75)?

Answer and explanation

Correct answer: 74

Here, the first term is 2 and the common difference is 4. Thus, \(a_n=2+4(n-1)=4n-2\). From \(4n-2<75\), we get \(n<19.25\), so the greatest integer value of n is 19. Therefore, \(a_{19}=74\), which is the last term less than 75. The next term, 76, is not less than 75. 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 TermInequalityLast TermClass 10 MathematicsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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