Find the sum of the first 30 terms of the sequence: 12, 15, 18, 21, …, 390, 780, 490, 1665, What is the sum of the first 25 natural numbers?, 65, 325, 100, 540, Find the sum of the first 40 terms of the sequence: 7, 11, 15, 19, …, 1100, 2575, 1820, 3400

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