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1 . You flip a fair coin 7 times. Define the event
  • A = "the result of the first flip is equal to the result of the 7-th flip".
What is $\Pr(A)$?
(a)
$1/4$
(b)
$\frac{2^5 + 2}{2^7}$
(c)
$1/2$
(d)
$1/3$