The value of $3+\frac{1}{\sqrt3}+\frac{1}{3+\sqrt3}+\frac{1}{\sqrt3-3}$ is
Solution
✅ Correct Option: 2
Add the last two fractions first, since those are the messy ones. $\dfrac{1}{3+\sqrt3}+\dfrac{1}{\sqrt3-3}=\dfrac{(\sqrt3-3)+(3+\sqrt3)}{(3+\sqrt3)(\sqrt3-3)}$ $\text{Numerator}=2\sqrt3$ Using the identity $(A+B)(A-B)=A^2-B^2$ on the denominator: $\text{Denominator}=(\sqrt3)^2-3^2=3-9=-6$ So their sum is $\dfrac{2\sqrt3}{-6}=-\dfrac{\sqrt3}{3}=-\dfrac{1}{\sqrt3}$ Put this back into the original expression: $3+\dfrac{1}{\sqrt3}-\dfrac{1}{\sqrt3}=3$
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