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Find the power series expantion of f(z)=log(4=3z) at the point z=-1

Twenty-five percent of the customers entering a grocery store between 5 p.m. and 7 p.m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r