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Question

Which of the following is not equal to 1?


A

23×334×18

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B

-23×-24-27

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C

30×535×25

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D

2470+303

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Solution

The correct option is D

2470+303


Step 1. Explanation for the correct option.

Simplify:

23×334×18=8×274×18=21672=31

And,

2470+303=241+13...[a0=1]=2423=24-3...[aman=am-n]=21=2

Therefore, 23×334×18=31 and 2470+303=21

Step 2. Explanation for the incorrect options.

-23×-24-27=-23+4-27...[am×an=am+n]=-27-27=1

And,

30×535×25=1×535×25...[a0=1]=5353=1

As, -23×-24-27 and 30×535×25 are equal to 1.

Hence, the correct options are A and D.


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