If from each of the three boxes containing 3 white and 1 black, 2 white and 2
black, 1 white and 3 black balls, one ball is drawn at random, then the probability
that 2 white and 1 black balls will be drawn is:
If $\vec{a}$ and $\vec{b}$ are two unit vectors such that $\vec{a}+2\vec{b}$ and $5\vec{a}-4\vec{b}$ are perpendicular to each other, then the angle between $\vec{a}$ and $\vec{b}$ is:
Let $\vec{a}=\hat{i}-\hat{j}$ and $\vec{b}=\hat{i}+\hat{j}+\hat{k}$ and $\vec{c}$ be a vector such that $(\vec{a} \times \vec{c})+\vec{b}=0$ and $\vec{a}.\vec{c}=4$, then $|\vec{c}|^2$ is equal to
If $\vec{a}$, $\vec{b}$, $\vec{c}$ and $\vec{d}$ are the unit vectors such that $(\vec{a} \times \vec{b}).(\vec{c} \times \vec{d})=1$ and $(\vec{a}.\vec{c})=\frac{1}{2}$, then
A spring is being moved up and down. An object is attached to the end of the
spring that undergoes a vertical displacement. The displacement is given by the
equation $y = 3.50 sint + 1.20 sin2t$. Find the first two values of t (in seconds) for
which y =0.
A ball is thrown off the edge of a building at an angle of 60° and with an initial
velocity of 5 meters per second. The equation that represents the horizontal
distance of the ball x is $x={{\nu}}_0(\cos \theta)t$, where ${{\nu}}_0$ is the initial velocity. $\theta$ is the
angle at which it is thrown and $t$ is the time in seconds. About how far will the ball
travel in 10 seconds?
The a, b, c and d are in GP and are in ascending order such that a+d = 112 and b+c 48. If the GP is continued with a as the first term, then the sum of the first six
terms is:
Statement I : If $A\subset B$ then B can be expressed as $B=A\cup(\overline{A}\cap B)$ and
P(A) > P(B).
Statement II : If A and B are independent events, then ($A$ and $\overline{B}$), ($\overline{A}$ and $B$)
and ($\overline{A}$ and $\overline{B}$) are also independent
In the light of the above statements, choose the most appropriate answer from the
options given below:
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : In a class of 40 students. 22 drink Sprite, 10 drink Sprite but not Pepsi. Then the number of students who drink both Sprite and Pepsi is 15.
Reason R: For any two finite sets A and B, $n(A) = n(A - B) + n (A \cup B)$
In the light of the above statements, choose the most appropriate answer from the options given below:
The arithmetic mean and standard deviation of series of 20 items were calculated
by a student as 20 cm and 5 cm respectively. But while calculating them an item
15 was misread as 30. Find the correct standard deviation.
Given the marks of 25 students in the class as $\{m_1,m_2,m_3,..m_{25}\}$. Marks lie in the
range of [1-100] and $\overline{m}$ is the mean. Which of the following quantity has the value
zero?
Consider n events ${{E}}_1,{{E}}_2\ldots{{E}}_n$ with respective probabilities ${{p}}_1,{{p}}_2\ldots{{p}}_n$. If $P\Bigg{(}{{E}}_1,{{E}}_2\ldots{{E}}_n\Bigg{)}=\prod ^n_{i=1}{{p}}_i$, then
Given three identical boxes B1 B2 and B3 each containing two balls. B1 containstwo golden balls. B2 contains two silver balls and B3 contains one silver and onegolden ball. Conditional probabilities that the golden ball is drawn from B1, B2, B3are ____,______,______ respectively