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Simplify and express in exponential form .

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answer is A.

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Detailed Solution

Concept- Instead of immediately computing the value of the given expression, try to break it down into smaller powers. We often apply the rules of exponents to address such situations.
Question Image

Factor 21:

Cancel the common factor: 7
Question Image

Factor

Cancel

Multiply the numbers:

.
Hence, the correct answer is option 1.

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