Don't be tricked!

Level pending

To please their children, Mr and Mrs Tan bought socks of their children's favourite colours. They bought 10 \({\color{green}{green}}\) socks for Benedict, 20 \({\color{blue}{blue}}\) socks for Bob, 30 \({\color{red}{red}}\) socks for Brenda, 40 \({\color{orange}{orange}}\) socks for Brian and 50 \({\color{yellow}{yellow}}\) socks for Billy.

Unfortunately, there was a blackout one night but Brenda wants to grab a pair of socks. Although she may not get her favourite \({\color{red}{red}}\) socks, she at least wants a pair of socks of the same colour. What is the MINIMUM number of socks she needs to pull out to be ABSOLUTELY certain of this?

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