What is the sum of the first 21 terms of the arithmetic series? -5 + (

1.	What is the sum of the first 21 terms of the arithmetic series? -5 + (-3) + (-1) + 1 + ... ?
Answer» <strong style="font-size: 15px; line-height: 20px !important;">What is the sum of the first 21 terms of the arithmetic series? -5 + (-3) + (-1) + 1 + ... ?</strong><p><strong>Solution:</strong></p>

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