# Entrance exams

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Suppose that the bivariate data ((xi,yi)),{i=1,2,….,n} lie on a straight line y-a+bx for some a,b belonging to R.assume further that neither all xi’s are same,nor all the yi’s.Which of the following values is NOT a possibility for the correlatyion coefficient calculated from the above data?

a)1   b)-1   c)0   d)none of the above.