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If (p, 18, 25, 32, ...) is an arithmetic progression, what is the value of p?

Answer and explanation

Correct answer: 11

Answer: 11, so option C is correct. The defining property of an arithmetic progression is a constant difference between consecutive terms. From the known terms, 25 - 18 = 7 and 32 - 25 = 7. Therefore the common difference is 7. Since p appears immediately before 18, adding 7 to p must give 18. Thus p + 7 = 18, so p = 11. The resulting sequence is 11, 18, 25, 32, ... , and its consecutive differences are all 7. Option A, 9, would give 18 - 9 = 9; option B, 10, would give a difference of 8; and option D, 12, would give a difference of 6. Each would break the constant-difference rule. Memory cue: when a missing term is before a known AP term, subtract the common difference from that known term.

Related tags

Arithmetic ProgressionMissing TermCommon DifferenceSequenceIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)Arithmetic Progressions Ap

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