$("#calculate").click(function(){ var p = $('#p').val(); var q = 1 - p; var x = $('#x').val(); var n = $('#n').val(); var computation = combinations(n, x) * Math.pow(q, n-x) * Math.pow(p, x); $('#result').html('P(x) =' + computation.toFixed(4)); }); $("input").change(function(){ var isInvalid = $('#pDiv').hasClass('is-invalid') || $('#xDiv').hasClass('is-invalid') || $('#nDiv').hasClass('is-invalid'); if(isInvalid){ $("#calculate").prop("disabled", true); }else{ $("#calculate").removeAttr('disabled'); } });

Probability of Success, ${p}$ Number required!

Required Successes, ${x}$ Number required!

Number of trials, ${n}$ Number required!