Obviously, the successive throws
of the die are independent experiments If the die is fair and have six numbers 1 to 6
written on six faces, then  p = 1
2  and q = 1 – p = 1
2  = probability of failure Example 30 Six balls are drawn successively from an urn containing 7 red and 9 black
balls Tell whether or not the trials of drawing balls are Bernoulli trials when after each
draw the ball drawn is
(i)
replaced
(ii)
not replaced in the urn