If r is a constant and an = r·n for all positive integers n, for how many values of n is an < 100? (1) a50 = 500 (2) a100 + a105 = 2,050_出国考试答疑器_GMAT_试题

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If r is a constant and a_n = r·n for all positive integers n, for how many values of n is a_n < 100?

(1) a₅₀ = 500

(2) a₁₀₀ + a₁₀₅= 2,050

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D

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