1.

Let f:XtoY be a function and A_(y)={(f^(-1)(y))/(yinY)} Then A_(i)nnA_(i)=phi(i""nej)AAi,jinYanduu_(yiny)A_(y)=X, if

Answer»

f is ONTO function only
f is one-one function only
f is any FUCTION
X and Y are FINITE SETS only

Answer :C


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