Six balls are drawn successively from an um 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.

Explanation

i)The number of trails are finite.So,When the drawing is done with replacement then the success is p=7/16.Hence the drawing of balls with replacement are Bernoulli trials.

ii)When the drawing is done with replacement the probabiloty of success of first trail is p=7/16 and 2nd trail is 6/15 if the first ball is red or 7/15 if the first ball is black.As all ar not same so the drawing of balls with out replacement are Bernoulli trials