Identify the probability distribution to answer the question

Identify the probability distribution to answer the question. A coin is flipped until it lands heads. The coin is biased and the probability of heads is .2 what are the odds that the coin will take more than 3 flips of the coin before it lands heads.

Solution

what are the odds that the coin will take more than 3 flips of the coin before it lands heads.

1 - 0.8*0.8*0.8

1 - 0.512

0.488