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In (11, 15, 19, 23, …), what are (d) and (a) respectively?

Answer and explanation

Correct answer: d = 4, a = 11

For an arithmetic progression, a denotes the first term and d denotes the constant difference between consecutive terms. The first term listed is 11, so a = 11. Calculate the common difference using adjacent terms: d = 15 - 11 = 4. The result is confirmed by 19 - 15 = 4 and 23 - 19 = 4. Because the question asks for d and a in that order, the required pair is d = 4, a = 11, which is option B. Option A reverses the meanings of the symbols. Option C incorrectly treats a later term as d, while option D uses the second term as a even though a must be the first term. Careful attention to the requested order is essential.

Related tags

Arithmetic-ProgressionFirst-TermCommon-DifferenceIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)Arithmetic Progressions ApMathematics

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