Welcome to GMAT Club Jozu!
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?
Founder of GMAT Club
Just starting out with GMAT? Start here... | Want to know your GMAT Score? Try GMAT Score Estimator
Need GMAT Book Recommendations? Best GMAT Books
Co-author of the GMAT Club tests
Have a blog? Feature it on GMAT Club!
Get the best GMAT Prep Resources with GMAT Club Premium Membership