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        <lastmod>2025-03-01T15:52:37.13987578Z</lastmod>
        
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            <Attribute name="title">Arithmetic series</Attribute>
            <Attribute name="description">Practice evaluating arithmetic series using the formula (n/2)⋅(a₁+aₙ).</Attribute>
            <Attribute name="author">Ben Alpert</Attribute>
            <Attribute name="type">exercise</Attribute>
            
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