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1 as squares have to have equal sides
5x2 + 3x2 = 16
Probability of drawing a red marble = 4/16 = 1/4 Probability of drawing not a red marble = 1 - 1/4 = 3/4
There are 16 of them because 16/4 = 4
one 1/16 x 16 = 16/16 = 1/1 = 1