જો $y=(x+3)^2 \cdot(x+4)^3 \cdot(x+5)^4$ હોય,તો $x$ ની સાપેક્ષે $y$ નું પ્રથમ ક્રમનું વિકલન . . . . . . છે.

  • A
    $y \left( \frac{2}{x+3} + \frac{3}{x+4} + \frac{4}{x+5} \right)$
  • B
    $y \left( \frac{3}{x+3} + \frac{4}{x+4} + \frac{5}{x+5} \right)$
  • C
    $y \left( \frac{2}{x+3} + \frac{3}{x+4} + \frac{5}{x+5} \right)$
  • D
    $y \sum_{i=2}^4 \left( \frac{i}{x+i+1} \right)$

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જો $y = [(x+1)(2x+1)(3x+1) \ldots (nx+1)]^2$ હોય,તો $x=0$ આગળ $\frac{dy}{dx}$ ની કિંમત શોધો.

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