This is a simple question from Diagnostic section of OG11.Still I took so much time to slove it.If I work out at this rate then I guess I would be the least scorer ever . Pls guys let me know if there is a shortcut for these kind of questions.
Q:The product of all the prime numbers less than 20 is closest to which of the following powers of 10?
Do I've to multiply 2,3,5,7,11,13,17 and 19 to compare the answer? Is there a better way to do it?