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Question
8

P L S A N S Question 8 or following number euo The product or i , 6 and O.n fraction 5, The mean Of first five natural numbers is: 7/9. then the value of x : 7. O is 5% of which number? (b) 20 8.' 'The number of edges in a polyhedron having 8 face. (b) 16 (C) 18 (d) 20 9 The probability of a sure event is always: 10. Thrice a number when increased by 9 gives 27. The . Units have numerically

Dear Student,

N u m b e r o f f a c e s (F) = 8 N u m b e r o f v e r t i c e s (V) = 12 N u m b e r o f e d g e s (E) = ? A n y p o l y h e d r o n s a t i s f i e s E u l e r' s f o r m u l a a c c o r d i n g t o w h i c h : F + V - E = 2 \Rightarrow 8 + 12 - E = 2 \Rightarrow 20 - E = 2 \Rightarrow E = 20 - 2 \Rightarrow E = 18 A n s w e r : O p t i o n C

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