This is a very hard interview question, apparently asked during a number of Google and Amazon interviews. In my personal experience, I have asked this question to a number of people. Similar to me, only after providing a second hint to the question, have they been able to solve it.

**How many hints do you need to solve this question?** (add it to the comments)

Hint 1

Neither Mathematics nor any numbers are applicable in this riddle

Hint 2

Think of the alphabet.

Hint 3

Answer

The answer is SSSS.

7 The sequence presented is A, B, C, D, …

The “S” presents a straight line. “C” presents a curved line.

Since A has three “S”traight lines, it is represented by three S.

B has two “C”urved lines and one “S”traight line, therefore, SCC.

E, the next letter after D, is presented by 4 “S”traight lines.