1.

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

Answer»

`C^(2)`=a(B+c)
`a^(2)=c(a+b)`
`b^(2)=a(b+C)`
`(1)/(a)+(1)/(b)+(1)/( c)=1`

ANSWER :C


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