The product of all the prime numbers less than 25 is closest to which of the following powers of 10?  Choices:	A) 10^9	B) 10^8	C) 10^7	D) 10^8	E) 10^5
Quickly approximate   2, 3, 5, 7, 11, 13, 17, 19,23   =2.2 *10^8   10^8
<result>D</result>
The product of all the prime numbers less than 25 is closest to which of the following powers of 10?