Question
हृासमान फलन $f(x) = {x^3} - {x^2} - x - 4$ का अंतराल है
यह फलन हृासमान होगा, जब $f'(x) < 0$
==> $3{x^2} - 2x - 1 < 0 \Rightarrow 3{x^2} - 3x + x - 1 < 0$
==> $(3x + 1)(x - 1) < 0$;
$\therefore 3x + 1 > 0$ व $x - 1 < 0$
$x > - \frac{1}{3}$ व $x < 1$;
$\therefore x \in \left( {\frac{{ - 1}}{3},\,1} \right)$.
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$f(n)=n+\frac{16+5 n-3 n^2}{4 n+3 n^2}+\frac{32+n-3 n^2}{8 n+3 n^2}+\frac{48-3 n-3 n^2}{12 n+3 n^2}+\ldots+\frac{25 n-7 n^2}{7 n^2}$
परिभाषित कीजिए। तब $\lim _{ n \rightarrow \infty} f( n )$ का मान है