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[" 6.If "^(56)P(r+6):^(54)P(r+3)=30800:1...

[" 6.If "^(56)P_(r+6):^(54)P_(r+3)=30800:1," then "r=],[[" (a) "31," (b) "41," (c) "51," (d) None of these "]]

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