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Let N be the number of non-negative integral solution of the equation x+y+z+ω=15 where x≥0,y>5,z≥2, and ω≥1. The unit digit of N is

Answer» Let N be the number of non-negative integral solution of the equation x+y+z+ω=15 where x0,y>5,z2, and ω1. The unit digit of N is


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