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题库 / Prep2007E1-PS-2
The product P of two prime numbers is between 9 and 55. If one of the prime numbers is greater than 2 but less than 6 and the other is greater than 13 but less than 25, then P =
15
33
34
46
51
两个质数的乘积P介于9和55之间。其中一个质数大于2小于6另一个质数大于13小于25，P=？
大于2小于6的质数有3和5，大于13小于25，有17,19,23，乘积最小为3*17=51，只有这个数落在了9-55这个区间之内，选E