JEE Advanced 2015 · Paper 1 · Mathematics Q43

MathematicsInteger+4Question 43 of 60

The minimum number of times a fair coin needs to be tossed, so that the probability of getting at least two heads is at least 0.96, is

Your answer

Answer and worked solution

Official answer: 8

Probability. P(at least two heads in $n$ tosses) $=1-\dfrac{1+n}{2^n}$ . We need
$\frac{n+1}{2^n}\le0.04.$

Check values.

Answer: 8

Topics:Independent events Classical probability

JEE Advanced 2015 · Paper 1, Mathematics question 43