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There is a neater way to post questions. You can learn how to post math symbols here: writing-mathematical-symbols-in-posts-72468.html
. Usually, all you have to do is to highlight the text and hit the M button. Bu there are exceptions such as fractions.
You can also hide the Original Answer using the "Spoiler" functionality. I added it to your post. Here is the original question rewritten:
The product of all the prime numbers less than 20 is closest to which of the following powers of 10?
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