suprememodelrus wrote:
If x is a positive integer, is x a prime integer?
(1) x+1 is a prime number.
(2) x-5 is a prime number.
(1) x+1 is a prime number.
(2) x-5 is a prime number.
Hi Bunuel, My approach does not look standard. Is it correct?
From statement 1: X= 1,2,4,6,10,12,16,18........
From statement 2: X= 7,8,10,12,16,22........
common from the both statements are 10,12,16..... Thus X is not a prime integer.
Kindly provide algebric approach if possible.
Thanks in advance