3 4 سحق الصخور النهر لاستخدام لfounation سقيفة ... In mathematics, the infinite series 1 / 2 − 1 / 4 + 1 / 8 − 1 / 16 + ⋯ is a simple example of an alternating series that converges absolutely.. It is a geometric series whose first term is 1 / 2 and whose common ratio is − 1 / 2, so its sum is.
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