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Most rounds a card completes nothing: 87.68% of the time. It completes at least one line 12.32% of the time, but nearly all of those are a single line, which only gives your stake back. Two or more lines come about once every 144 rounds.

Add up the main draw on its own and a card pays back about 16.31% of its price. The published return is 95.40% for one card, with a range down to 95.05%. The difference comes from the Mega Ball round: a 5x to 100x multiplier on a card that the Mega Ball finishes. How often each multiplier appears is not published.

1 Refreshing your card changes nothing

All 51 balls are in the machine every round, so every number has the same 39.22% chance. Refreshing your card swaps one random set of numbers for another with exactly the same odds, and past draws tell you nothing about the next one.

2 Each card pays back less than it costs

The published figure for one card is 95.40%: about $95.40 back for every $100 spent over time. Its published range runs down to 95.05%, so the cost never falls below about 4.60%.

3 Ten cards, ten times the cost

Ten cards make a winning line far more likely each round, but you pay for all ten, and each one keeps the same edge. A single line on one of them still only gives that card's stake back.