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If (p, 11, 15, 19, ...) is an arithmetic progression, what is the value of p?

Answer and explanation

Correct answer: 7

The governing concept is that every pair of consecutive terms in an arithmetic progression has the same common difference. Using the known terms, the difference is d = 15 − 11 = 4. This is confirmed by 19 − 15 = 4, so the progression increases by 4 at every step. The term immediately before 11 must therefore be found by moving one step backward and subtracting 4: p = 11 − 4 = 7. Hence option C is correct. Option A would make the difference from p to 11 equal to 8, option B would make it 6, and option D would make it 2. None of those values preserves the constant difference of 4 across the sequence.

Related tags

Arithmetic ProgressionCommon DifferenceMissing TermIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)Arithmetic Progressions ApMathematics

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