Logic puzzles, riddles, math puzzles and brainteasers - pzzls.com

Vandaag is het 22 February 2018

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Painting stairs - math puzzle

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   Rating: 2.4/5.0

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To enter the house of the professor, you first have to walk up a stairs which consists out of twenty steps. The professor thinks his stairs are boring so he decides to paint them. He buys two colors, yellow and green.

Every step will be either painted yellow or green and moreover the professor does not want to have two yellow steps directly after each other. In how many ways can the professor paint his stairs? And what is the name of the professor?
stairs

F-Counting - logic puzzle

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   Rating: 2.8/5.0

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Out of how many F's does the following sentence consist?

FINISHED FILES ARE THE RE-
SULTS OF YEARS OF SCIENTIF-
IC STUDY COMBINED WITH THE
EXPERIENCE OF YEARS

Never number one - puzzling puzzle

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   Rating: 2.0/5.0

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You can be the last joining person, but you will never be first. What is it?