Keisha decides to roll a number cube until she gets a 6. Let X = the number of rolls until she rolls a 6.
What is the probability that Keisha gets her first 6 before her 3rd roll? Round to 3 decimal places.
Recall: P(X= k) = (1-p)k-1p
O 0.139
O 0.167
O 0.306
O 0.421
Done