Number sequence conditions
CMAT 2018 · Logical Reasoning · Easy · Sequence and Series
2 3 7 4 3 2 1 5 7 3 2 7 1 0 9 8 7 5 4 7 2 3
Find the number of 7 in the given series that are followed by an even number but are not preceded by a prime number?
- A.
1
- B.
2
- C.
3
- D.
4
Answer
A
Explanation
We look for pattern: [Non-Prime Number] - 7 - [Even Number]. Let's check all 7s in the sequence:
- ...3 7 4... : Preceded by 3 (prime) - No.
- ...5 7 3... : Followed by 3 (odd) - No.
- ...2 7 1... : Followed by 1 (odd) - No.
- ...8 7 5... : Followed by 5 (odd) - No.
- ...4 7 2... : Preceded by 4 (non-prime) and followed by 2 (even) - YES!
Total count = 1.
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