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Question

Pavan is making a human face using stickers, for 1 face he need 3 stickers, for 2 faces he need 6 stickers and so on. How many stickers does he require to make 6 faces?
  1. 18 stickers
  2. 12 stickers
  3. 15 stickers
  4. 9 stickers


Solution

The correct option is A 18 stickers
As given in the question, we can write as 

1 face need 3×1 = 3 stickers
2 faces  need 3×2  = 6 stickers
3 faces  need 3×3  = 9 stickers
4 faces  need 3×4 = 12 stickers
 .               .
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n faces  need 3×(n) = 3n stickers.
          
Number of stickers required to make 6 faces
= 3×6
= 18
 

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