Read the row of digits below from left to right.
2 3 6 8 6 1 4 6 9 6 2 5 7 6 0 6 3 8 4 6 1 5 6 7
How many 6s in this row have an odd digit directly before them?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 4
Check every 6 in the row: the digit just before it must be odd (1, 3, 5, 7 or 9).
Place 3: 3 6 8 — counts
Place 5: 8 6 1 — does not count (preceded by 8, which is even)
Place 8: 4 6 9 — does not count (preceded by 4, which is even)
Place 10: 9 6 2 — counts
Place 14: 7 6 0 — counts
Place 16: 0 6 3 — does not count (preceded by 0, which is even)
Place 20: 4 6 1 — does not count (preceded by 4, which is even)
Place 23: 5 6 7 — counts
So the answer is 4.