Question: 2017 Winter Final - 10
We choose, uniformly at random, a string consisting of 14 characters, where each character is a
lowercase letter. Let $A$ be the event
- A = "the string contains at least one vowel".
(a)
$1 - (21/26)^{14}$
(b)
$14 \cdot (5/26) \cdot (21/26)^{13}$
(c)
$5 \cdot (5/26) \cdot (21/26)^{13}$
(d)
$1 - (26/21)^{14}$