1 . 1 - 1 + 1 - 1 + 1 - 1 +.......+n সংখ্যক পদের যোগফল হবে -
- A. 0
- B. 1
- C. [1 + (-1)n]
- D. 1/2 [ 1 - (-1)n]
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1 . 1 - 1 + 1 - 1 + 1 - 1 +.......+n সংখ্যক পদের যোগফল হবে -
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