. If bYX is the slope of coefficient of regression line of Y on X, and bXY is the slope coefficient of regression line of X on Y then which of the following is true :-
a) bYX is positive implies that ...
... bXY is positive
b) bYX is positive implies that bXY is negative
c) bYX and bXY are reciprocals
d) The product of bYX and bXY is zero
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