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Let S={(a,b,c)∈N×N×N:a+b+c=21,a≤b≤c} and T={(a,b,c)∈N×N×N:a,b,c are in A. P.}, where N is the set of all natural numbers. Then the number of elements in the set S∩T is

Answer»

Let S={(a,b,c)N×N×N:a+b+c=21,abc} and T={(a,b,c)N×N×N:a,b,c are in A. P.}, where N is the set of all natural numbers. Then the number of elements in the set ST is



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