The number of triangles whose vertices are at the vertices of a regular octagon but none of whose sides is a side of the octagon is (1) 48 (2) 56 (3) 24 (4) 16
The number of triangles whose vertices are at the vertices of a regular octagon but none of whose sides is a side of the octagon is\\
(1) 48\\
(2) 56\\
(3) 24\\
(4) 16