1
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

If $\sin A+\sin 2 A=x$ and $\cos A+\cos 2 A=y$ then the value of the expression $\left(x^2+y^2\right)\left(x^2+y^2-3\right)$ equals

A

0

B

$3 y$

C

$\frac{y}{2}$

D

$2 y$

2
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Given the matrices $A=\left[\begin{array}{lll}1 & 0 & 1 \\ 0 & 1 & 0 \\ 1 & 0 & 2\end{array}\right]$ and $B=\left[\begin{array}{lll}2 & 1 & 0 \\ 1 & 1 & 2 \\ 0 & 2 & 1\end{array}\right]$, then the minor $\boldsymbol{M}_{\mathbf{2 3}}$ of the matrix $\left(A B^{-1}\right)^{-1}$ is:

A

2

B

9

C

4

D

-9

3
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The order and degree of the differential equation $\left(\frac{d y}{d x}\right)^2+\frac{d x}{d y}=x$ is:

A

$(1,1)$

B

$(1,2)$

C

$(2,1)$

D

$(1,3)$

4
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A teacher has two jars of candy on her desk:

Jar 1: Contains 3 Strawberry candies and 2 Orange candies.

Jar 2: Contains 1 Strawberry candy and 4 Orange candies.

The teacher randomly picks two candies from Jar 1 and drops them into Jar 2.

Then, a student reaches into Jar 2 and picks two candies.

What is the probability that the student picks two Strawberry candies?

A

$\frac{6}{35}$

B

$\frac{4}{21}$

C

$\frac{3}{70}$

D

$\frac{1}{14}$