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9" x 13" cm is the size of 3R pic
3r + 3r + 2t = 6r + 2t
7r = 3r - 527r (- 3r) = 3r - 52 (- 3r)4r = - 524r / 4 = -52 / 4r = -13
(3r - 2)(3r - 2) or (3r - 2) squared.
It is the ratio between the size of the sample and the size of the population.