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[" If "("P(r-1))/(a)=("P(r))/(b)=(nP(r+1...

[" If "("P_(r-1))/(a)=("P_(r))/(b)=(nP_(r+1))/(c)" ,then which of the following hold "],[" good? "],[[" (a) "c^(2)=a(b+c)," (b) "a^(2)=c(a+b)],[" (c) "b^(2)=a(b+c)," (d) "(1)/(a)+(1)/(b)+(1)/(c)=1]]

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