The answer would be D. It would be $42 in the end if you picked D.
The probability of getting all heads is 1 / 2^6 = 1/64 as there is only 1 event where this happens in a possible 2^6 = 64 events. It is the same as the probability of getting all tails. The probability of getting at least 1 head is 1 - p(all tails) = 63/64.
<span>y=375/x, so when x=1, y=375</span>
