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These numbers also give the solution to certain enumerative problems, [69] the most common of which is that of counting the number of ways of writing a given number n as an ordered sum of 1s and 2s (called compositions); there are F n+1 ways to do this (equivalently, it's also the number of domino tilings of the rectangle).
Like the natural numbers, is closed under the operations of addition and multiplication, that is, the sum and product of any two integers is an integer. However, with the inclusion of the negative natural numbers (and importantly, 0 ), Z {\displaystyle \mathbb {Z} } , unlike the natural numbers, is also closed under subtraction .
42 is a pronic number, [1] an abundant number [2] as well as a highly abundant number, [3] a practical number, [4] an admirable number, [5] and a Catalan number. [6]The 42-sided tetracontadigon is the largest such regular polygon that can only tile a vertex alongside other regular polygons, without tiling the plane.
After "Fat Lip", two more singles were released from the album: "In Too Deep" and "Motivation". [19] [16] [23] "In Too Deep" peaked at number 10 on the Modern Rock Tracks chart, while "Motivation" peaked at number 24 on the same chart. [24] The album peaked at number 13 on the Billboard 200 chart and at number nine on the Top Canadian Albums ...