The Monotone Draw Payout

A lottery drum holds 8484 balls numbered 11 through 8484. After a thorough mixing, five balls are drawn out one at a time. A ticket costs $1\$1 and pays $x\$x if the five numbers emerge in strictly increasing or strictly decreasing order; otherwise it pays nothing. What value of xx makes the ticket exactly break-even in expectation?

Answer

Free accounts unlock one worked solution a day. Pro includes every answer.