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25 July, 13:21

A certain website requires a login password to be formed by 5 numbers from digits 1-9 followed by 2 letters from the alphabet. How many passwords can be formed if neither the digits nor the letters are repeated?

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  1. 25 July, 13:24
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    Step-by-step explanation:

    password = 5 number + 2 letters

    total number = g

    total letter = 26

    relection and arrengment both apply here

    total password = gc5 * 26c2 * 7!

    = 126 x 325 x 5040

    total password = 2.06388 x 10^8
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