For a Binomial distribution,

1) The probability of success is constant at every trial.

2) There are only 2 outcomes i.e. Success and Failure

3) The trails must be independent.

4) The number of trials 'n' is fixed.

So, option 2, 4,6 and 7 are the correct options.

{X counts the number of trials until we get a success if it has a Geometric distribution}

1) The probability of success is constant at every trial.

2) There are only 2 outcomes i.e. Success and Failure

3) The trails must be independent.

4) The number of trials 'n' is fixed.

So, option 2, 4,6 and 7 are the correct options.

{X counts the number of trials until we get a success if it has a Geometric distribution}