WBJEE 2015 Math Solved Paper

Question : 55 of 80

Marks: +1, -0

Let S = {(a, b, c) ∊ N × N × N : a + b + c = 21, a ≤ b ≤ c} andT = {(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 ofelements in the set S ∩ T is