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Find the probability of guessing at leas...

Find the probability of guessing at least 6 out of 10 answers in
True false type examination

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The correct Answer is:
i) `underset(r=6)overset(10)sum""^(10)C_(r)((1)/(2))^(10)` ii) `underset(r=6)overset(10)sum""^(10)C_(r)((1)/(4))^( r )((3)/(4))^(10-r)`
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