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25 January, 04:10

An internet passcode consists of a digit followed by a letter, followed by another digit. Assuming the digits are 0-9, how many different passcode are possible?

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  1. 25 January, 07:21
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    There are 10 single-digits (0 through 9) and 26 letters (A through Z)

    For the first slot there are 10 choices which represents selecting a single digit

    For the second slot there are 26 choices because we choose a single letter here.

    Finally there are another 10 choices for the third slot (assuming repeats are allowed)

    Multiply the values out: 10*26*10 = 260*10 = 2600

    Answer: 2600
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