Mathematics · 2017
JEE Main · 8 April 2017, Shift 1 · Q87
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 :
Official answer
(2)
$\displaystyle \frac{127}{128}$
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JEE Main 2017 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.