A batch of $\mathbf{1 0}$ cupcakes consists of $\mathbf{5}$ chocolate, $\mathbf{3}$ vanilla, and $\mathbf{2}$ strawberry. If 4 cupcakes are selected to be put into a gift box, find the number of different ways they can be chosen if the selection must include at least $\mathbf{2}$ chocolate, at most $\mathbf{1}$ vanilla, and exactly $\mathbf{1}$ strawberry cupcake.
20
80
60
1200
If a straight line passing through a fixed point $(a, b)$, where $\boldsymbol{a}, \boldsymbol{b}>\mathbf{0}$, makes positive intercepts OA and OB on the coordinate axes, then the least value of $\mathbf{O A}+\mathbf{O B}$ is:
$(\sqrt{a}+\sqrt{b})^2$
$(\sqrt{a}+\sqrt{b})^3$
$a+b$
$(\sqrt{a}-\sqrt{b})^2$
Let $\mathbf{P}$ be a point on the line $L_1: \frac{x-2}{2}=y+1=\frac{z-1}{2}$ such that its distance from the point $A(2,-1,1)$ is 6 units.
Given that $\boldsymbol{x}$-coordinate of $\mathbf{P}$ is greater than $\mathbf{2}$,
Find the coordinates of point Q on the line $L_2: x-1=\frac{y-2}{2}=\frac{z-2}{2}$ such that $\mathbf{Q}$ is the closest point to $\mathbf{P}$.
$$ \left(-\frac{14}{9},-\frac{28}{9},-\frac{28}{9}\right) $$
$$ (2,4,4) $$
$$ (6,1,5) $$
$$ (1,2,2) $$
The range of the function $f(x)={ }^{(7-x)} P_{(x-3)}$ is
$\{1,2,3,4\}$
$\{1,2,3,4,5\}$
$\{1,2,3,4,5,6\}$
$\{1,2,3\}$
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