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A mathematical operation that expresses the addition of the numeral "one" with another "one".
1+1 may also refer to:
- 1+1 (album), a 1972 album by Grin
- 1 + 1 (album), a 1997 duet album by Herbie Hancock and Wayne Shorter
- "1+1" (song), by Beyoncé Knowles
- 1+1 is a Ukrainian TV channel.
- One Plus One, original title of the film Sympathy for the Devil
- One Plus One (comics), 2002 graphic novel published by Oni Press
- OnePlusOne, (Marriage and Partnership Research) founded in 1970 by Dr Jack Dominian
- OnePlus One, an Android smartphone manufactured by OnePlus in 2014
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