Mathematics · Arithmetic Progression
For an arithmetic progression a1, a2, a3, ... with common difference d, the expression a12 - a22 + a32 - a42 + ... - a2k2 is equal to:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1-kd(a1 + a2k)✓
- 2kd(a1 + a2k)
- 3-kd(a1 - a2k)
- 4kd(a1 - a2k)
Correct answer
-kd(a1 + a2k)
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