Answer:
For Part A:
The total of 1+4+3 marbles is 8 marbles
P( blue ) = blue /total = 4/8 = 1/2
He replaces it, so there are still 8 marbles in the bag
P(blue 2nd draw) = blue /total = 4/8 = 1/2
P(blue,replace, blue) = 1/2*1/2 = 1/4
For Part B:
1 choc chip, 3 almond, 2 butter. 6 total cookies.
probability of picking 1 almond on first pick : 3/6 which is 1/2
without replacement
probability of drawing another almond : 2/5
Probability of drawing 1 almond followed by another (without replacement ) is:
3/6 * 2/5 = 6/30 = 1/5
Explanation: