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Sanchay ran a piece of gum through a machine of $(1 × 3 − 2)$ . What length did the stick have when it emerged?

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9 cm

18

17

19

answer is D.

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Detailed Solution

It is given Sanchay ran a piece of gum through a machine of

(1 × 3 − 2)

.
It has a negative sign so, it is a shrinking machine
Length of stick

= 1 × 3 − 2

Using the exponent law,

⇒ 1 × 132

⇒ 19

Therefore, length of the stick came out to the machine is

19

cm.
Hence, option (4) is correct.

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