Read the row of digits below from left to right.
2 7 1 3 7 4 6 7 2 2 7 9 3 7 5 8 3 7 0 7 2 7 6 1 3 7 8 4
How many 7s in this row have 2 or 3 directly before them, but neither 1 nor 5 directly after them?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 5
Check every 7 in the row: the digit before it must be 2 or 3, and the digit after it must not be 1 or 5.
Place 2: 2 7 1 — does not count (followed by 1)
Place 5: 3 7 4 — counts
Place 8: 6 7 2 — does not count (preceded by 6)
Place 11: 2 7 9 — counts
Place 14: 3 7 5 — does not count (followed by 5)
Place 18: 3 7 0 — counts
Place 20: 0 7 2 — does not count (preceded by 0)
Place 22: 2 7 6 — counts
Place 26: 3 7 8 — counts
So the answer is 5.