Berapakah jumlah dari seluruh bilangan kelipatan 5 antara 100 dan 200 (tidak termasuk 100 dan 200)?

Answer and explanation

Correct answer: D. 2.850

Bilangan: 105, 110, ..., 195. Jumlah suku n = (195 - 105)/5 + 1 = 90/5 + 1 = 18 + 1 = 19 suku. Jumlah Sn = 19/2 (105 + 195) = 19/2 300 = 19 * 150 = 2.850.

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