No number is a symbol(E) + No symbol is a letter(E) ⇒ No conclusion. Hence, conclusion I does not follow. No symbol is a letter(E) ⇒ Conversion ⇒ Some letters are not symbols (O). Hence, conclusion II follows. No symbol is a letter(E) + No letter is a draft(E) ⇒ No conclusion. Hence, conclusion III does not follow.