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In the sequence (20,15,10,5,\ldots), what are the first term and common difference respectively?

Answer and explanation

Correct answer: (20, -5)

The first term of the sequence is 20. The common difference is the second term minus the first term: 15 − 20 = −5, and this difference continues between consecutive terms. Therefore, the correct ordered pair is (20, −5). Option C has the wrong sign for the difference, while options B and D use an incorrect first term. Exam tip: “respectively” means that the answers must be given in the same order as the quantities asked.

Related tags

Arithmetic ProgressionsFirst TermCommon DifferenceNegative DifferenceIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)Arithmetic Progressions Ap

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