Refer to the following series(Left) 2 1 7 9 4 5 3 4 4 1 8 2 2 4 4 9 7 6 9 9 4 6 2 9 9 8 7 (Right)

We are asked to count the odd numbers which are immediately preceded and followed by odd numbers in the series:

2, 1, 7, 9, 4, 5, 3, 4, 4, 1, 8, 2, 2, 4, 4, 9, 7, 6, 9, 9, 4, 6, 2, 9, 9, 8, 7

Step 1: Identify odd numbers

Odd numbers are: 1, 3, 5, 7, 9

Step 2: Check each odd number (except first and last)

We need an odd number immediately preceded and followed by odd numbers.

• Sequence positions with odd numbers:
  1 → neighbors 2 (even) & 7 (odd) → No
  7 → neighbors 1 (odd) & 9 (odd) → Yes ✅
  9 → neighbors 7 (odd) & 4 (even) → No
  5 → neighbors 4 (even) & 3 (odd) → No
  3 → neighbors 5 (odd) & 4 (even) → No
  1 → neighbors 4 (even) & 8 (even) → No
  9 → neighbors 4 (even) & 7 (odd) → No
  7 → neighbors 9 (odd) & 6 (even) → No
  9 → neighbors 6 (even) & 9 (odd) → No
  9 → neighbors 9 (odd) & 4 (even) → No
  9 → neighbors 2 (even) & 9 (odd) → No
  9 → neighbors 9 (odd) & 8 (even) → No
  7 → last number, ignore

Step 3: Count

Only one number (7) satisfies the condition.

Answer: 1