1
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0
How many 5-digit numbers greater than 50,000 can be formed using the digits 1, 2, 3, 4, 5 without repetition?
A
60
B
72
C
120
D
48
2
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

The value of $$1\,.\,1! + 2\,.\,2! + 3\,.\,3! + \,...\, + \,n\,.\,n!$$ is

A
$$(n + 1)!$$
B
$$(n + 1)! + 1$$
C
$$(n + 1)! - 1$$
D
None of these
3
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

The number of triangles which can be formed by using the vertices of a regular polygon of $$(n+3)$$ sides is 220. Then, $$n$$ is equal to

A
8
B
9
C
10
D
11
4
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

Out of 8 given points, 3 are collinear. How many different straight lines can be drawn by joining any two points from those 8 points?

A
26
B
28
C
27
D
25
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