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Find the sum of all multiples of 9 lying between 300 and 700.

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Find the sum of all multiples of 9 lying between 300 and 700.

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Multiples of 9 lying between 300 and 700 = 306, 315, 324, 333, …, 693

Here, a = 306, d = 9, and l = 693

We know that, l = a + (n-1)d

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