“0.02 power 10” is probability of win on every ticket. which is indeed very low.
chance of win on at least one ticket is 1-(1-0.0002)^10
(1-0.0002) is chance of loss on one ticket (0.0002 = 0.02%)
(1-0.0002)^10 is chance of loss on every ticket
1-(1-0.0002)^10 is chance of opposite event, i.e. at lest one win.
With low-probability events like yours, you can use 10*0.0002 = 0.2% as an approximation. It is not exact, but it is close enough.
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