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In an AP, (a=17), (d=1). What is the (40)th term?

Answer and explanation

Correct answer: 56

The nth term of an AP is \(a_n=a+(n-1)d\). Therefore, \(a_{40}=17+(40-1)\times1=17+39=56\). Hence, 56 is correct. Getting 55 is an off-by-one error, because 39 common differences are added after the first term. Exam tip: always use \(n-1\) when finding the nth term.

Related tags

Arithmetic ProgressionNth TermCommon DifferenceAp FormulaClass 10 MathematicsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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