If a = Number of vertices of a tetrahedron b = Number of edges of a tetrahedron c = Number of faces of a tetrahedron Then the value of a+b+c is
A
14
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B
16
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C
10
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D
12
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Solution
The correct option is A 14 A tetrahedron is formed by the help of four planes as you can see in the figures . A tetrahedron is composed of four triangular faces, six straight edges and four vertex corners ⇒ a+b+c = 4+6+4 = 14