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For the arithmetic progression whose nth term is \(a_n=7-3n\), which pair correctly gives its first term and common difference?

Answer and explanation

Correct answer: First term 4 and common difference -3

Putting \(n=1\) gives \(a_1=7-3=4\). In \(a_n=a+(n-1)d\), the coefficient of \(n\) is the common difference, so \(d=-3\). Exam tip: always verify the first term by substituting \(n=1\).

Related tags

Arithmetic ProgressionNth TermCommon DifferenceFirst TermLinear SequenceFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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