જો $f(x)$ એ વિકલનીય વિધેય હોય અને $f''(0) = a$ હોય,તો $\mathop {\lim }\limits_{x \to 0} \frac{2f(x) - 3f(2x) + f(4x)}{x^2}$ ની કિંમત શું થાય ($a$ માં)?

  • A
    $3$
  • B
    $2$
  • C
    $5$
  • D
    $4$

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જો $\lim _{x}$ ${\rightarrow 1} \frac{(5 x+1)^{1 / 3}-(x+5)^{1 / 3}}{(2 x+3)^{1 / 2}-(x+4)^{1 / 2}}=\frac{m \sqrt{5}}{n(2 n)^{2 / 3}}$,જ્યાં $\operatorname{gcd}(m, n)=1$,તો $8 m+12 n$ ની કિંમત શોધો.

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