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What is the general term of the sequence (1, 8, 27, 64, …)?

Answer and explanation

Correct answer: aₙ = n³

The governing concept is identifying an nth-term rule from position-number relationships. The terms are consecutive perfect cubes: 1 = 1³, 8 = 2³, 27 = 3³, and 64 = 4³. Therefore the term in position n is a_n = n³, making option B correct. Substitution verifies the rule: n = 1 gives 1, n = 2 gives 8, n = 3 gives 27, and n = 4 gives 64. Option A gives the square sequence 1, 4, 9, 16. Option C gives 3, 6, 9, 12, while option D gives 2, 4, 8, 16 when n starts at 1. Thus only n³ agrees with every displayed term and with the position pattern.

Related tags

Nth-TermSequencesPerfect-CubesExplicit-RuleNth TermSequences And ProgressionsMathematicsClass 9 Mcq

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