The order of magnitude of 49 and the order of magnitude of 51 :

is same

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differs by 1

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is 1

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is 2

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Solution

The correct option is B differs by 1
For 49 :

We can write $49$ as $4.9 \times 10^{1}$
Since 4.9 is lesser than 5.
Hence, its order of magnitude will be 1.

For 51 :

We can write $51$ as $5.1 \times 10^{1}$
Since 5.1 is greater than 5, so it is more closer to 10 than 1.
Hence, its order of magnitude will be 2.

Therefore, the order of magnitude of 49 and the order of magnitude of 51 differs by 1.

Hence option (B) is correct.

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