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If `a , b , c` are consecutive positive integers and `(log(1+a c)=2K ,` then the value of `K` is `logb` (b) `loga` (c) 2 (d) 1

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a=m
b=m+1
c=m+2
`log(1+ac)=2k`
LHS
`=log(1+ac)`
`=log(1+m(m+2))`
`=log(1+m^2+2m)`
...
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