Let the population of a species of birds surviving at a time ' $\boldsymbol{t}$ ' be governed by the differential equation $\frac{d p}{d t}-p=-100$. If $p(0)=50$, then $p\left(-\log _e 2\right)$ is equal to
100
90
75
40
A coffee roaster has $\mathbf{1 2}$ rare coffee beans with intensity scores ranked from $\mathbf{1}$ (mildest) to $\mathbf{1 2}$ (strongest).
You choose 7 beans at random and line them up from mildest to strongest:
$$ C_1< C_2< C_3< C_4< C_5< C_6< C_7 $$
What is the probability that the third bean $\left(C_3\right)$ has an intensity score of exactly 4 ?
$\frac{1}{4}$
$\frac{21}{44}$
$\frac{5}{18}$
$\frac{35}{132}$
A coach needs to select a $\mathbf{4}$-player starting lineup from a pool of $\mathbf{1 0}$ players:
5 guards
3 forwards
2 centres
Find the number of different selections if the 4-player starting lineup must include:
At least 1 guard
At most 1 forward
Exactly 1 centre
60
20
70
80
$$ \text { The domain of the function } f(x)=\sin ^{-1}(\sqrt{x-1}) $$
$$ (-\infty, 1] \cup[2, \infty) $$
$$ [-1,1] $$
$$ [1,2] $$
$$ [0,1] $$
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