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12 September, 09:45

How many different twotwo -letter passwords can be formed from the letters Upper A comma Upper B comma Upper C comma Upper D comma Upper E comma Upper F comma Upper G and Upper HA, B, C, D, E, F, G and H if no repetition of letters is allowed?

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  1. 12 September, 12:20
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    8p2 = 8! / (8-2) !

    = 8! : 6!

    = 8 x 7

    = 56.

    Cheers
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