જો $y = \frac{a + b{x^{3/2}}}{{x^{5/4}}}$ અને $x = 5$ પર $y' = 0$ હોય,તો ગુણોત્તર $a:b$ કેટલો થાય?

  • A
    $\sqrt{5} : 1$
  • B
    $5 : 2$
  • C
    $3 : 5$
  • D
    $1 : 2$

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