Rabab36 wrote:
zhanbo wrote:
(1) Only
x could be 2 or 23
Not sufficient.
(2) Only
x must be 2.
Because other prime numbers n are all odd, so n+1 is even and cannot be another prime number.
Sufficient.
The answer is thus (B).
x could be 2 or 23
Not sufficient.
(2) Only
x must be 2.
Because other prime numbers n are all odd, so n+1 is even and cannot be another prime number.
Sufficient.
The answer is thus (B).
sir can you pls explain how x can be 2 or 23 in statement 1
between 11 13 17 19 23
x can be 23 only
Starting from 2,
3, 5, 7
11
There are three prime numbers between 2 and 11.
Statistics : Posted by zhanbo • on 26 Jun 2023, 01:30 • Replies 4 • Views 259