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    Put A = 1.2 + 2.3 + 3.4 + ....... + 199.200

     => 3A = 1.2.3 - 1.2.3 + 2.3.4 - 2.3.4 + ....... + 199.200.201

    => 3A = 199.200.201

    => A = 199.200.201/3

    => A = 2666600

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