For the equation X+Y+Z+W = 19, the numbe...

For the equation X+Y+Z+W = 19, the number of positive integral solutions is equal to
(A) The number of ways in which 19 identical things can be distributed among 4 persons so that each gets atleast one thing
(B) The number of ways in which 15 identical things can be distrusted to 4 persons so that each person get any number of things.
(C) 18C_3
(D) 22C_3

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