A parrot has lived for less than 100 years and can only answer “yes” or “no” to questions.
How many questions will you need to ask to find out his age?
7 You can cut the number of possible answers in half with each question. With 1 question you can distinguish between 2¹ = 2 ages. With 2 questions, you can distinguish between 2² = 4 ages. With 6 questions, you can distinguish between 2⁶ = 64 ages. 7 questions will get you to 2⁷ = 128 which is finally enough to cover the 100.
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