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The Product Rule
Question: 2018 Fall Midterm - 3
1 . Consider strings of length 15, where each character is a lowercase letter or an uppercase letter. How many such strings contain at least two lowercase letters?
(a)
None of the above.
(b)
$52^{15} - 26^{15} - 15 \cdot 26^{14}$
(c)
$52^{15} - 26^{15} - 15 \cdot 26^{15}$
(d)
$52^{15} - 15 \cdot 26^{15}$
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