railway DFCCIL Junior Executive 2023 (CBT 1 & CBT 2) Mock Test Logical Reasoning Arrangement and Pattern Number Arrangement
How many such 1s are there in the following number sequence which are neither immediately preceded by 7 nor immediately followed by 5?
9 1 4 9 7 7 1 8 7 1 7 1 9 9 1 9 1 6 4 1 9 2 1 7
1
three
2
six
3
four
4
five