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# A certain stock exchange designates each stock with a one-, two- or th

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Math Expert
Joined: 02 Sep 2009
Posts: 65854
Re: A certain stock exchange designates each stock with a one-, two- or th  [#permalink]

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21 Apr 2020, 06:08
ShivamoggaGaganhs wrote:
Bunuel, can you please explain the theory behind this problem. Why 26^2 and 26^3?

For a two-letter code the first letter can be any from 26, similarly the second letter can also be any from 26, thus the total number of two-letter codes is 26*26 = 26^2. You can apply the same logic for three-letter codes.
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Joined: 28 Mar 2020
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Re: A certain stock exchange designates each stock with a one-, two- or th  [#permalink]

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10 Jun 2020, 08:32
Wait, but as in this calculation you're counting both ABC and ACB, as we are told order does matter, are you not also counting AAB and AAB twice?
Re: A certain stock exchange designates each stock with a one-, two- or th   [#permalink] 10 Jun 2020, 08:32

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