How many 5's are there in the following number sequence each of which is immediately preceded By '2' or '3' and is immediately succeeded by '7' or '8'?
3 5 8 5 2 5 7 3 5 8 2 5 6 3 5 7 5 5
- AOption (a)
4
- BOption (b)
5
- COption (c)
3
- DOption (d)
2
View answer & explanationHide answer & explanation
Correct answer
4
Why this answer is correct
3 5 8 5 2 5 7 3 5 8 2 5 6 3 5 7 5 5
Condition to be checked:
- 5's in the series which are succeeded by 7 or 8 & preceded by 2 or 3.
2 or 3 → 5 → 7 or 8
• 5's which are preceded by 2 or 3:
3 5 8 5 2 5 7 3 5 8 2 5 6 3 5 7 5 5
• 5's which are preceded by 2 or 3 & succeeded by 7 or 8:
3 5 8 5 2 5 7 3 5 8 2 5 6 3 5 7 5 5
There are Four such 5's in the series that follows the condition.
Hence the correct answer is "4".



