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Rohitanand · Answer 1 · 2019-09-06T06:16:26+0000

Think of it this way:
8^3 means you have 3 times 8 multiplied together (8*8*8)
Now this block is raised to the power of 7, so there are 7 blocks of 8*8*8 multiplied together.
How many 8s do we have? 7 blocks of 3s, 7*3=21
Thus n=21

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