Question 146Asked in Bihar STET 2025 Paper II Computer Science, 4 Nov 2025, Shift 2 (2:00 PM)

The number of vertices (V) , edges (E) and faces (F) of a polyhedron are respectivelyकिसी बहुफलक के शीर्षों (V), किनारों (E) और फलकों (F) की संख्‍याऍं क्रमश: 10,15 और x है। तब

The number of vertices (V) , edges (E) and faces (F) of a polyhedron are respectively 10,15 and x. Then, the value of (3x-12) is :
किसी बहुफलक के शीर्षों (V), किनारों (E) और फलकों (F) की संख्‍याऍं क्रमश: 10,15 और x है। तब (3x-12) का मान है:
  1. A99
  2. B1414
  3. C1818
  4. D77
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Correct answer: (A) 99

Explanation

Euler's formula V - E + F = 2 gives 10 - 15 + F = 2, so F = 7. Then 3x - 12 = 21 - 12 = 9.Euler सूत्र V - E + F = 2 से 10 - 15 + F = 2, यानी F = 7। तब 3x - 12 = 21 - 12 = 9।

From Bihar STET 2025 Paper II Computer Science PYQ, 4 Nov 2025, Shift 2 (2:00 PM)

This is question 146 of Bihar STET 2025 Paper II Computer Science PYQ, 4 Nov 2025, Shift 2 (2:00 PM). See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.