In (0,5,10,15,\ldots), what are (d) and (a) respectively?

Correct answer: \(d=5,\ a=0\)

The first term of the sequence is \(a=0\). The common difference is the difference between consecutive terms: \(5-0=5\), so \(d=5\). Therefore, in the order \(d\) and \(a\), the answer is \(d=5,\ a=0\). \(d=10\) is incorrect because it is the difference between the first and third terms, not between consecutive terms. Exam tip: always use \(a=a_1\) and \(d=a_2-a_1\).