The product of all the prime numbers less than or equal to19 is closest to which of the following powers of 10 ?	Choose the correct choice:  A) 10^9  B) 10^8  C) 10^6  D) 10^7  E) 10^5
P = 2*3*5*7*11*13*17*19   = 21 * (11 * 19) (13*17) *10   ~ 21 * (10 * 20) (10 *20) * 10   ~ 8210 ^5   ~ 10^ 7   Answer : 10^7
<result>D</result>
The product of all the prime numbers less than or equal to19 is closest to which of the following powers of 10 ?