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?

18 stickers

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12 stickers

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15 stickers

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9 stickers

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Solution

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

1 face need $3 \times 1$ = 3 stickers
2 faces need $3 \times 2$ = 6 stickers
3 faces need $3 \times 3$ = 9 stickers
4 faces need $3 \times 4$ = 12 stickers
. .
. .
. .
. .
. .
n faces need $3 \times (n)$ = 3n stickers.

$∴$ Number of stickers required to make 6 faces
$= 3 \times 6$
$= 18$

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