Riddle

I am as simple as a circle, worthless as a leader; but when I follow a group, their strength increases tenfold. By myself I'm practically nothing. What am I?

Choose an answer

A.circle
B.null
C.the letter O
D.zero
Hint: It's a word with 4 letters, starting with "Z".

Answer

zero

Why this is the answer

Zero looks like a plain circle, means nothing on its own or when leading a number, yet placed after other digits it multiplies their value tenfold with each one added.

This riddle is filed under Long Riddles and rated Medium.

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