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In the figure above, P, Q, R, S and T are five different points no three of which are on the same straight line. How many different triangles can be drawn that have three of the five points as vertices if P must be one vertex of each triangle?
(A) 3
(B) 4
(C) 5
(D) 6
(E) 7
Attachment:
2017-08-18_1027_003.png [ 3.79 KiB | Viewed 2253 times ]
Luckisnoexcuse
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18 Aug 2017, 01:09
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Bunuel
In the figure above, P, Q, R, S and T are five different points no three of which are on the same straight line. How many different triangles can be drawn that have three of the five points as vertices if P must be one vertex of each triangle?
(A) 3
(B) 4
(C) 5
(D) 6
(E) 7
Attachment:
2017-08-18_1027_003.png
If P has to be one vertex then we are left with 4 points (Q,R,S,T) and we need to select 2 out of these 4 points to form a triangle with P as one of vertex
4C2 = 6
D
