f(x,y) =6 (x-y), 0 < y< x < 1 എന്നത് (x,y) യുടെ joint pdf ആണെങ്കിൽ x - ന്ടെ marginal pdf ?
A3x² , y < x < 1
B3x² , 0 < x < 1
C3xy , y < x < 1
D3x² , 0 < x < 1
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