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Find the sum of all integers between 84 and 719 which are exactly divisible by 3

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The sequence is 87, 90 ... 717

a = 87, an = 717, d = 3

an = a + (n - 1)d

717 = 87 + 3n - 3

633 = 3n

n = 211

S211 = n/2 (a + an)

        = 211/2 (87 + 717)

        = 211 × 402 

        = 84822

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