1
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
What is the number of triangles that can be formed by choosing the vertices from a set of 12 points in a plane, seven of which lie on the same straight line?
A
185
B
175
C
115
D
105
2
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
What is C(n, r) + 2C(n, r $$-$$ 1) + C(n, r $$-$$ 2) equal to?
A
C(n + 1, r)
B
C(n $$-$$ 1, r + 1)
C
C (n, r + 1)
D
C (n + 2, r)
3
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
What is C(47, 4) + C(51, 3) + C(50, 3) + C(49, 3) + C(48, 3) + C(47, 3) equal to?
A
C(47, 4)
B
C(52, 5)
C
C(52, 4)
D
C(47, 5)
4
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If n! has 17 zeroes, then what is the value of n?
A
95
B
85
C
80
D
No such value of n exists
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