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

Question

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 $d$.

What is the correct answer to this question?

First term 7 and common difference -3

Why is this the correct answer?

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 $d$.

Which subject and chapter does this question cover?

This is a Class 10 Mathematics question. Chapter: Arithmetic Progressions (AP). Topic: Finding the $n$th term of an AP.