railway DFCCIL Junior Executive 2023 (CBT 1 & CBT 2) Mock Test Logical Reasoning Arrangement and Pattern Number Arrangement
Consider the following number sequence:
1 3 6 9 4 3 4 7 3 8 7 9 7 9 7 9 5 6 2 2 4 8 5 9 5 5 1 7 16 21 11 3 2 2 7
How many numbers are there in the above series which are both followed and preceded by prime number?
1
7
2
5
3
3
4
11