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If (a=18) and (d=-7), what is the (6)th term?

Answer and explanation

Correct answer: \(-17\)

The nth term of an AP is \(a_n=a+(n-1)d\). Therefore, \(a_6=18+(6-1)(-7)=18-35=-17\). Hence, \(-17\) is correct. An option such as \(-15\) may result from an error in multiplication or subtraction. Exam tip: When \(d\) is negative, keep it in brackets while substituting in the formula.

Related tags

Arithmetic ProgressionNth TermAp FormulaClass 10Negative Common DifferenceFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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