The product of all the prime numbers less than 20 is closest to which of the following powers of 10? Choose the correct choice from the following choices:	A) 10^9	B) 10^8	C) 10^7	D) 10^6	E) 10^5
Quickly approximate   2, 3, 5, 7, 11, 13, 17, 19   Make groups     2*5= 
<gadget id="calculator">  2*5</gadget>
<output>10</output>
10   3*17= 50 (approximately)   7*13 = 100 (approximately)   11*19 = 200 (approximately)   So you make 7 zeroes (the 2 and the 5 also make a 0). When you multiply all these, the answer will be close to 10^7   ANSWER:10^7
<result>C</result>
The product of all the prime numbers less than 20 is closest to which of the following powers of 10?