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A tag consists of a sequence of four alphanumeric signs (letters or

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A tag consists of a sequence of four alphanumeric signs
(letters or digits).How many tags with alternating letters
and digits begin with either the digit 9 or the letter m?
Warning: pay attention tot he requirement of alternation.
Solution
Tags with 9 as starting will be possible in : 1(9 as starting)
* 26(letter) * 10(digit) * 26(letter) = 6760
Tags with m as starting will be possible in : 1(m as
starting) * 10(digit) * 26(letter) * 10(digit) = 2600
Thus, total tags with alternating letters and digits begin
with either the digit 9 or the letter m =
6760 + 2600 = 9360 tags.

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A tag consists of a sequence of four alphanumeric signs (letters or digits).How many tags with alternating letters and digits begin with either the digit 9 or the letter m? Warning: pay attention tot he requirement of alternation. Solution Tags with 9 as starting will be possible in : 1(9 as start ...
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