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If the nth term of an arithmetic progression is \(a_n=4-7(n-1)\), which of the following statements is correct?

Answer and explanation

Correct answer: The common difference is \(-7\) and the AP is decreasing.

Comparing with \(a_n=a+(n-1)d\), we get \(a=4\) and \(d=-7\). A negative common difference means each next term is 7 less, so the AP decreases. Exam tip: the coefficient of \((n-1)\) is the common difference.

Related tags

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

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