Lion or virgin

We toss coin, every throw fits lion or a virgin with equal probability 1/2. Determine how much at least we have to make throws that with probability 0.9 lion fell at least once.

Correct result:

n =  4


0.5n<10.9 0.5n<0.1 nln0.5>ln0.1 n>3.32 n=4

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