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Source:
wikibot/1-2-minus-1-4-plus-1-8-minus-1-16-plus-⋯
= 1/2 − 1/4 + 1/8 − 1/16 + ⋯ {wiki=1/2_−_1/4_+_1/8_−_1/16_+_⋯}
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