Good girls and bad boys (7)

Logic Level 2

On an island, there is this strange pattern - boys always lie while girls always tell the truth. This time round, you encounter four children.

  • The oldest one says, "Exactly one of us is a boy."

  • The second one says, "Exactly two of us are boys."

  • The third one says, "Exactly three of us are boys."

  • The youngest one says, "All four of us are boys."

Let 1 denote boys and 0 girls. In order of birth, identify the gender of each child and convert it into a number accordingly. Submit your answer as a string of 4 ones and/or zeroes. For example, if all four are boys, then your answer is 1111.


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