1.

If f_(n)(x) = log log…..log x(log is repeated n-times), then int (xf_(1)(x)f_(2)(x)…..f_(n)(x))^(-1) dx is equal to,

Answer»

`f_(N+1)(X)+c`
`(f_(a+1)(x))/(n+1)+c`
`nf_(n)(x)+c`
`(f_(n)(x))/n+c`

ANSWER :A


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