MCQ
$\left(1+\mathrm{x}+\mathrm{x}^{2}\right)^{10}$ ના વિસ્તરણમાં $x^{4}$ ના મેળવો.
- A$615$
- B$625$
- C$595$
- D$575$
$=^{10} \mathrm{C}_{0}+^{10} \mathrm{C}_{1} \mathrm{x}(1+\mathrm{x})+^{10} \mathrm{C}_{2} \mathrm{x}^{2}(1+\mathrm{x})^{2}$
$+^{10} \mathrm{C}_{3} \mathrm{x}^{3}(1+\mathrm{x})^{3}+^{10} \mathrm{C}_{4} \mathrm{x}^{4}(1+\mathrm{x})^{4}+\ldots \ldots$
Coeff. of $\mathrm{x}^{4}=^{10} \mathrm{C}_{2}+^{10} \mathrm{C}_{3} \times^{3} \mathrm{C}_{1}+^{10} \mathrm{C}_{4}=615$
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કારણ $(R)$ : $\theta$ ના બધા મુલ્યો માટે $xcos\ \theta + y\ sin \theta =\,a$ એ વર્તૂળ $x^2 + y^2 = a^2$ ને સ્પર્શેં છે.