1 − 2 + 4 − 8 + ⋯ a convergent geometric series whose sum is by the usual formula. The Borel sum of is also ; when Émile Borel introduced the limit formulation of Borel summation in 1896, this was one of his first examples after 1 − 1 + 1 − 1 + ⋯ 1 − 2 + 4 − 8 + ⋯ In mathematics, is the infinite series whose terms are the successive powers of two with alternating signs. As a geometric series, it is characterized by its first term, 1, and its common ratio, −2. As a series of real numbers it diverges, so in
Quavers bags were in a different layout, being in Landscape style. Quavers' logo was changed slightly, and the flavours remained the same. In 2009, Quavers, Squares, Wotsits and French Fries had all changed their packaging again because of a reduction in calories. Quavers has 87 calories (Currently 86) in the Cheese flavour. In 2011, Quavers packaging updated to a brighter bag colour with the Walkers logo on the packets again. The primary ingredient in Quavers is potato starch. They are deep fried to give a snack with a similar texture to Krupuk (prawn crackers), but have a different flavour and are