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

[" If "(nP_(r-1))/(a)=(nP_(r))/(b)=(nP_(r+1))/(c)," then "(b^(2))/(a(b+c))" is equal to "],[[" (a) "1," (b) "2],[" (c) "(1)/(2)," (d) None "]]

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