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[" 4.If "^(5)P(r)=2*^(6)P(r)-1" ,then th...

[" 4.If "^(5)P_(r)=2*^(6)P_(r)-1" ,then the value of "r" is "],[[" (a) "10," (b) "3," (c) "0," (d) None of these "]]

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