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  1. A solid has 12 vertices and 30 edges. How many faces does it have?
    1. 22
    2. 24
    3. 26
    4. 20
Correct Option: D

According to the Euler’s formula, V + F – E = 2
⇒ 12 + F – 30 = 2
⇒ F – 18 = 2
⇒ F = 18 + 2 = 20


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