A fair die is thrown until each of its 6 faces have been shown at least once, what is the expected number of throws?

thanks for any help

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- Aug 10th 2011, 03:18 AMhmmmmnumber of throws till die shows all faces
A fair die is thrown until each of its 6 faces have been shown at least once, what is the expected number of throws?

thanks for any help - Aug 10th 2011, 03:35 AMmr fantasticRe: number of throws till die shows all faces