Trial of an experiment

What is the sum of all the probabilities of trials of an experiment?

A man performs 10 trials of an experiment, if the probability of getting '4 sucesses' is maximum, then find the probability of failure in each trial.

If in 6 trials of an experiment the probability of a successes is 5 times the probability of a failure, then find the probability of two successes.

For 6 trials of an experiment,let X be a binomial variate which satisfies the relation 9P(X=4)=P(X=2). Find the probability of success.

Mean and variance of a Binomial variate are in the ratio of 3:2. The most probable number of happening of the variable in 10 trials of the experiment is?

If S_(1),S_(2) are the sample spaces of an experiment at the first two trials, then

The sum of the probabilities of all the trials of an events is ______.

If in a certain experiment the probability of success in each trial is 3/4 times the probability of failure, then the probability of at least one success in 5 trials is

Which of the following experiments have equally likely outcomes? Explain. A trial is made to answer a true-false question. The answer is right or wrong.