Read the row of digits below from left to right.
0 2 4 7 4 4 6 2 4 2 4 1 4 2 4 3 4 3 6 4 2 3
How many 4s in this row have 2 directly before them but do not have an even digit directly after them?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 3
Check every 4 in the row: the digit before it must be 2, and the digit after it must not be even (0, 2, 4, 6 or 8).
Place 3: 2 4 7 — counts
Place 5: 7 4 4 — does not count (preceded by 7)
Place 6: 4 4 6 — does not count (preceded by 4)
Place 9: 2 4 2 — does not count (followed by 2, which is even)
Place 11: 2 4 1 — counts
Place 13: 1 4 2 — does not count (preceded by 1)
Place 15: 2 4 3 — counts
Place 17: 3 4 3 — does not count (preceded by 3)
Place 20: 6 4 2 — does not count (preceded by 6)
So the answer is 3.