Subject: General Aptitude · Chapter: Number System · Exam: · Marks: · Difficulty:
The number of prime numbers between 301 and 320 are
(a)3
(b)4
(c)5
(d)6
Answer
Answer (as printed): C
Explanation
Each of the numbers 302, 303, 304, 305, 306, 308, 309, 310, 312, 314, 315, 316 and 318 is clearly a composite number. Out of 307, 311, 313, 317 and 319 clearly every one is prime. Hence, there are 5 prime numbers between 301 and 320.
Explanation as extracted from the printed page; notation may be imperfect.