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What is the sixth term of the geometric progression (64, 32, 16, ...)?

Answer and explanation

Correct answer: 2

Direct answer: the sixth term is 2, so B is correct. Each term is half of the preceding term: 32 ÷ 64 = 1/2 and 16 ÷ 32 = 1/2. Thus the common ratio is r = 1/2. Counting carefully gives a₁ = 64, a₂ = 32, a₃ = 16, a₄ = 8, a₅ = 4, and a₆ = 2. The formula confirms the list: aₙ = arⁿ⁻¹, so a₆ = 64(1/2)⁵ = 64/32 = 2. D, 8, is the fourth term, and C, 4, is the fifth term. A, 1, would be the seventh term after one more division by 2. The common mistake is to count the number of divisions rather than the term number: reaching the sixth term requires five multiplications by 1/2 because the first term is already given. Memory cue: term number n means n−1 ratio steps from the first term.

Related tags

SequencesGeometric-ProgressionNth-TermCommon-RatioGeometric ProgressionSequences And ProgressionsMathematicsClass 9 Mcq

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