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8 November, 17:31

The dial of a combination lock has all 26 letters of the alphabet on it. A combination is formed by dialing 3 different letters in a particular order. If the owner of the lock forgets the combination, how many trials may be needed to open the lock?

a) 17576

b) 15600

c) 78

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  1. 8 November, 19:59
    0
    3 differnent letters

    once you use one, ou can't use again

    slot method

    26 options for 1st slot

    25 options for 2nd (1 went to firstt slot)

    24 otpoins for 3rd

    mulipl together

    26*25*24=15600 options

    B is answer
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