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8 questions · timed · auto-graded

Question 13 Marks
Obtain the Inverse of the matrix $A=\left[\begin{array}{lll}0 & 1 & 2 \\ 1 & 2 & 3 \\ 3 & 1 & 1\end{array}\right]$ by using elementary
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Question 23 Marks
Find the equation of the plane which contains the line of intersection of the planes $x+2 y+3 z-4=0,2 x+y-z+5=0$ and which is perpendicular to the plane $5 x+3 y-6 z+8=0$.
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Question 33 Marks
The probability of a shooter hitting a target is $\frac{3}{4}$. How many minimum number of times must he/she fire so that the probability of hitting the target at least once is more than 0.99 ?
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Question 43 Marks
Solve the following linear programming problem graphically.
Minimise and Maximise $Z =3 x+9 y$
Subject to constraints : $x+3 y \leq 60, x+y \geq 10, x \leq y, x \geq 0, y \geq 0$.
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Question 53 Marks
Find the vector equation of the line passing through the point $(1,2,-4)$ and perpendicular to the two lines $\frac{x-8}{3}=\frac{y+19}{-16}=\frac{z-10}{7}$ and $\frac{x-15}{3}=\frac{y-29}{8}=\frac{z-5}{-5}$.
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Question 63 Marks
If x $\sqrt{1+y}+y \sqrt{1+x}=0$, for $-1 < x < 1$, prove that $\frac{d y}{d x}=-\frac{1}{(1+x)^2}$.
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Question 73 Marks
If $A=\left[\begin{array}{lll}1 & 0 & 2 \\ 0 & 2 & 1 \\ 2 & 0 & 3\end{array}\right]$, prove that $A^3-6 A^2+7 A+2 I=0$.
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Question 83 Marks
$A = R -\{3\}, B = R -\{1\}$ consider the function $f: A \rightarrow B$ defined by $f(x)=\frac{x-2}{x-3}$. Is $f$ bijective? If yes then find Inverse function of $f$.
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3 Marks - Maths STD 12 Science Questions - Vidyadip