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Multiple choice

The sum of $7$ terms of the series $1^2-2^2+3^2-4^2+5^2-6^2+...$ is

  1. $-21$
  2. $15$
  3. $28$
  4. $-35$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The series is (1^2-2^2) + (3^2-4^2) + (5^2-6^2) + 7^2. This is (-3) + (-7) + (-11) + 49 = -21 + 49 = 28.

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