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Class 10 Mathematics Arithmetic Progressions (AP)Finding the $n$th term of an APMedium

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If the \(n\)th term of an AP is \(a_n=7-3(n-1)\), what are its first term and common difference?

Answer and explanation

Correct answer: First term 7 and common difference -3

Comparing with \(a_n=a+(n-1)d\), we get \(a=7\) and \(d=-3\). Option B misses the negative sign. Exam tip: identify the coefficient of \(n-1\) as \(d\).

Related tags

Arithmetic Progressions Nth Term Common Difference Ap Formula Algebra Finding The $N$Th Term Of An Ap Finding The N Th Term Of An Ap Arithmetic Progressions (Ap)

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