Discrete Math

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Determine How many integer solution there are to X1+X2+X3+x4=19 if
A) 0 ¡Ü Xi for all 1 ¡Ü i ¡Ü 4

B) 0¡Ü Xi < 8 for all 1 ¡Ü i ¡Ü 4

C) 0¡ÜX1,¡Ü5,0¡ÜX2¡Ü6,3¡ÜX3¡Ü7,3¡ÜX4¡Ü8

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