1
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

$$\text { Find }{ }^n C_{21} \text {, if }{ }^n C_{10}={ }^n C_{12}$$

A
1
B
21
C
22
D
2
2
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

There are 10 points in a plane out of which 4 points are collinear. How many straight lines can be drawn by joining any two of them?

A
39
B
40
C
45
D
21
3
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The total number of numbers greater than 1000 but less than 4000 that can be formed using 0, 2, 3, 4 (using repetition allowed) are

A
125
B
105
C
128
D
625
4
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A polygon of n sides has 105 diagonals, then n is equal to

A
20
B
21
C
15
D
$$-$$14
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