defence exam Army Havildar SAC Mock Test Series 2025 Mathematics Probability Probability of Random Experiments
A biased coin with the probability of getting head equal to \(\frac{1}{4}\) is tossed five times. What is the probability of getting tail in all the first four tosses followed by head ?
1
\(\frac{81}{512}\)
2
\(\frac{81}{1024}\)
3
\(\frac{81}{256}\)
4
\(\frac{27}{1024}\)