An unbiased coin is tossed eight times. The probability of obtaining at least one head and at least one tail is
An unbiased coin is tossed eight times. The probability of obtaining at least one head and at least one tail is
- [JEE MAIN 2017]
- A
$\frac{{255}}{{256}}$
- B
$\frac{{127}}{{128}}$
- C
$\frac{{63}}{{64}}$
- D
$\frac{1}{2}$
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