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20 January, 14:14

How many strings can be formed using the letters a, b, c, d, e, f, with each letter used once, that that start with the letter f?

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  1. 20 January, 14:29
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    Hello,

    the only letters a, b, c, d, e have to be put.

    So 5!=1*2*3*4*5=120
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