Hello, I’m Julien. I’ve created this blog. It’s mainly about hacking and my journey in cyber, but good contributions are welcome.

Love the following problem, can you solve it in 10s (or less)?

A man goes to a bar, he sees 9 of his friends outside. They were waiting for him. They shake hands. How many handshakes does it make?

N.B.: we assume his friends were waiting for him to start greeting.

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