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QJEE MAIN 2020
If the equation, $x^2+b x+45=0(b \in R)$ has conjuate complex roots and they satisfy $|z+1|=2 \sqrt{10}$, then
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QJEE MAIN 2020
The shortest distance between the lines $\frac{x-3}{3}=\frac{y-8}{-1}=\frac{z-3}{1}$ and $\frac{x+3}{-3}=\frac{y+7}{2}=\frac{z-6}{2}$ is
JEE MainMathematicsEasy
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QJEE MAIN 2020
The mean and the standard deviation (s.d.) of 10 observations are 20 and 2 respectively. Each of these 10 observations is multiplied by $p$ and...
JEE MainMathematicsEasy
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QJEE MAIN 2020
If $a, b$ and $c$ are the greatest values of ${ }^{19} \mathrm{C}_{\mathrm{p}},{ }^{20} \mathrm{C}_{\mathrm{q}}$ and ${ }^{21} \mathrm{C}_{\mathrm{r}}$ respectively, then
JEE MainMathematicsEasy
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QJEE MAIN 2020
Which one of the following is a tautology?
JEE MainMathematicsMedium
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QJEE MAIN 2020
For which of the following ordered pairs $(\mu, \delta)$, the system of linear equations $...
JEE MainMathematicsEasy
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QJEE MAIN 2020
Let the volume of a parallelopiped whose coterminous edges are given by $\overrightarrow{\mathrm{u}}=\hat{\mathrm{i}}+\hat{\mathrm{j}}+\lambda \hat{\mathrm{k}}, \quad \overrightarrow{\mathrm{v}}=\hat{\mathrm{i}}+\hat{\mathrm{j}}+3 \hat{\mathrm{k}}$ and $\overrightarrow{\mathrm{w}}=2 \hat{\mathrm{i}}+\hat{\mathrm{j}}+\hat{\mathrm{k}}$ be 1 cu. Unit. If...
JEE MainMathematicsEasy
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QJEE MAIN 2020
Let $f: R \rightarrow R$ be such that for all $x \in R\left(2^{1+x}+2^{1-x}\right), f(x)$ and $\left(3^x+3^{-x}\right)$ are in A.P., then the minimum value of $f(x)$...
JEE MainMathematicsMedium
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QJEE MAIN 2020
Arrange the following solutions in the decreasing order of pOH
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