Let $f$ be a non-negative function defined on the interval $[0,1]$. If $\int_0^x \sqrt{1-(f(t))^2} d t =\int_0^x f(t) d t, 0 \leq x \leq 1$ and $f(0)=0$, then
$f\left(\frac{1}{2}\right)<\frac{1}{2}$ and $f\left(\frac{1}{3}\right)>\frac{1}{3}$
$f\left(\frac{1}{2}\right)<\frac{1}{2}$ and $f\left(\frac{1}{3}\right)<\frac{1}{3}$
$f\left(\frac{1}{2}\right)>\frac{1}{2}$ and $f\left(\frac{1}{3}\right)>\frac{1}{3}$
$f\left(\frac{1}{2}\right)>\frac{1}{2}$ and $f\left(\frac{1}{3}\right)<\frac{1}{3}$
The set of real value of $x$ for which $\log _{0.2} \frac{x+2}{x} \leq 1$ is
$\left(-\infty,-\frac{5}{2}\right] \cup(0, \infty)$
$(-\infty,-2) \cup[0, \infty)$
$\left[\frac{5}{2}, \infty\right)$
None of these
Sum to 10 terms of the series $1+2(1 \cdot 1)+3(1 \cdot 1)^2+4(1 \cdot 1)^3+$ $\_\_\_\_$ is
85.12
96.75
92.5
100
The equation of the straight line through the origin and parallel to the line
$$ \begin{aligned} & (b+c) x+(c+a) y+(a+b) z=k= \\ & (b-c) x+(c-a) y+(a-b) z \text { is } \end{aligned} $$
$\frac{x}{b^2-c^2}=\frac{y}{c^2-a^2}=\frac{z}{a^2-b^2}$
$\frac{\boldsymbol{x}}{a^2-b c}=\frac{\boldsymbol{y}}{b^2-c a}=\frac{\boldsymbol{Z}}{c^2-a b}$
$\frac{x}{b}=\frac{y}{c}=\frac{z}{a}$
$\frac{x}{b^2+c^2}=\frac{y}{c^2+a^2}=\frac{z}{a^2+b^2}$
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