a 9 x 13= 117 sq inches; if each serving is 3 x 3 inch you can get 117/9 = 13 servings
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There are 13*12/2 = 78 lines.
Its factors are: 1, 3, 13 and 39 which makes four of them
13 items of any set can be listed in 13! different ways. That's 1 x 2 x 3 x 4 x ... x 13.
10 and 13 have a difference of 3 and a product of 130. 13 - 10 = 3 13 x 10 = 130
The least common denominator of 3 and 13 is 39.