if `a=sumx^n ,b=sumx^n , c=sum(xy)^n`

if a=sum x^(n),b=sum y^(n),c=sum(xy)^(n) where |x|,|y|<1 then

If a=sum x^(n),b=sum y^(n),c=sum(xy)^(n) where |x|,|y|<1 then

if x=sum a^(n),y=sum b^(n),z=sum c^(n) where a,b,c are in AP then x,y,z are in

If n = 5,sumx = sumy = 20, sumx^2 = sumy^2 = 90 , sumxy = 76 Find Covariance (x,y)

If n = 5,sumx = sumy = 20, sumx^2 = sumy^2 = 90 , sumxy = 76 Find the regression equation of x on y.

If n = 6, sumx = 36, sumy = 60,sumxy = -67 , sumx^2 =50 , sumy^2 =106, Estimate y when x is 13.

Covariance (x,y) between x and if sumx=15, sum y=40, sumxy=110, n=5 is

If a=sum_(n=0)^(oo)x^(n),b=sum_(n=0)^(oo)y^(n),c=sum_(n=0)^(oo)(xy)^(n) where |x|,|y|<1 then

If a=sum_(n=0)^(oo)x^(n),b=sum_(n=0)^(oo)y^(n),c=sum_(n=0)^(oo)(xy)^(n) where |x|,|y|<1 then

If x=sum_(n=0)^oo a^n, y=sum_(n=0)^oo b^n where |a|<1,|b|<1 then prove that sum_(n=0)^oo (ab)^n=(xy)/(x+y-1)