Refer to the following series and answer the question. Counting to be done…
2026
Refer to the following series and answer the question. Counting to be done from left to right only. (All numbers are single digit numbers only).
(Left) 6 9 5 4 2 1 4 5 8 4 6 7 3 6 8 5 2 9 1 2 1 7 4 4 5 5 8 4 4 2 (Right)
How many such prime digits are there each of which is immediately preceded by an even digit and also immediately followed by an even digit?
- A.
More than three
- B.
One
- C.
Two
- D.
Three
Attempted by 44 students.
Show answer & explanation
Correct answer: C
1. Identify prime digits: 2, 3, 5, 7. Identify even digits: 0, 2, 4, 6, 8. 2. We need to find the specific pattern: [Even Digit] -> [Prime Digit] -> [Even Digit]. 3. Scanning the given series from left to right for prime digits and checking their neighbors: - ... 4 5 8 ... (4 is even, 5 is prime, 8 is even) -> Matches. - ... 8 5 2 ... (8 is even, 5 is prime, 2 is even) -> Matches. Other prime digits in the series either have an odd number before them or after them. 4. Total occurrences of this pattern = 2. Final Answer: Option C