1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
The least value of ' $a$ ' such that the function $x^2+a x+1$ is increasing on $[1,2]$ is
A
4
B
2
C
$-$2
D
1
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Three fair dice are thrown. What is the probability of getting a total of 15 given that they exhibit three different numbers that are in arithmetic progression?
A
$\frac{1}{8}$
B
$\frac{1}{6}$
C
$\frac{1}{4}$
D
$\frac{1}{2}$
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
The variance of 25 observations is 8 . If each observation is multiplied by 3 , then the new variance of the resulting observations is
A
8
B
$\frac{8}{9}$
C
24
D
72
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
P is a point on the line joining the points $(3,5,-1)$ and $(6,3,-2)$. If $y$ coordinate of point P is 2 , then $x$ coordinate will be
A
$-5$
B
$\frac{3}{2}$
C
$\frac{15}{2}$
D
$\frac{9}{2}$
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