--------------------------------------------------- 10,11,12,13,14,15,16,1,7,18,19,20 1.n+3 = prime number prime numbers= 11,13,17,19 n+3=11,13,17,19 so n=8,10,14,16(not prime number) 2. n-1=11,13,17,19 n=12,14,18,20 (not prime number)
--------------------------------------------------- 10,11,12,13,14,15,16,1,7,18,19,20 1.n+3 = prime number prime numbers= 11,13,17,19 n+3=11,13,17,19 so n=8,10,14,16(not prime number) 2. n-1=11,13,17,19 n=12,14,18,20 (not prime number)
D
so....D??
-- by 会员 gpigpigpi (2010/3/26 13:16:02)
我在想这个如果包括20的话,条件一,20+3=23 也是prime number 所以条件一和条件二中都有14和20,不能确定,选E吧
--------------------------------------------------- 10,11,12,13,14,15,16,1,7,18,19,20 1.n+3 = prime number prime numbers= 11,13,17,19 n+3=11,13,17,19 so n=8,10,14,16(not prime number) 2. n-1=11,13,17,19 n=12,14,18,20 (not prime number)
D
so....D?? -- by 会员 gpigpigpi (2010/3/26 13:16:02)
我在想这个如果包括20的话,条件一,20+3=23 也是prime number 所以条件一和条件二中都有14和20,不能确定,选E吧