Lion or virgin

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

Correct answer:

n =  4

Step-by-step explanation:

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



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