Counting & ProbabilityHardRecursion, Catalan Numbers & Generating Functions ShareRecursion, Catalan Numbers & Generating Functions · Hard problemHow many solutions in integers (a,b,c,d)(a,b,c,d)(a,b,c,d) are there to a+b+c+d=12a+b+c+d=12a+b+c+d=12 with 0≤a,b,c,d≤50\le a,b,c,d\le 50≤a,b,c,d≤5?Check Show answer Walk through it step by step Practice more like this Review this concept