1
NDA Mathematics 14 November 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
Consider a regular polygon with 10 sides. What is the number of triangles that can be formed by joining the vertices which have no common side with any of the sides of the polygon?
A
25
B
50
C
75
D
100
2
NDA Mathematics 14 November 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
Consider the digits 3, 5, 7, 9. What is the number of 5-digit numbers formed by these digits in which each of these four digits appears?
A
240
B
180
C
120
D
60
3
NDA Mathematics 14 November 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
How many distinct matrices exist with all four entries taken from (1, 2)?
A
16
B
24
C
32
D
48
4
NDA Mathematics 18 April 2021
MCQ (Single Correct Answer)
+2.5
-0.83
Change Language
What is C(n, 1) + C(n, 2) + _ _ _ _  _ + C(n, n) equal to
A
2 + 22 + 23 + _ _ _ _ _  + 2n
B
1 + 2 + 22 + 2+ _ _ _ _ _ + 2n
C
1 + 2 + 22 + 23 + _ _ _ _ _ _ + 2n - 1
D
2 + 22 + 23 + _ _ _ _ _ + 2n - 1
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