Hard
A letter series follows a hidden pattern: _ b _ ab _ cb _ a _ c. Which option correctly fills the five blanks in order?
Explanation
Explanation
If we repeat the 6-letter block 'cbaabc' twice (cbaabc cbaabc), it reads: c-b-a-a-b-c-c-b-a-a-b-c, and this matches every given letter in the sequence exactly. Reading off the letters that fall in the five blank positions gives c, a, c, a, b - that is, 'cacab'.
PRO TIP
Re-check your working by substituting the answer back into the original question.