Question 861896
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Hi
15 chips: 5 red, 7 white, 3 blue 
19) If you draw four chips with replacement, what is the probability that all four are white? (7/15)^4
 20) If you draw four chips without replacement, what is the probability that all four are white? {{{ (7/15)(6/14)(5/13)(4/12)}}}
 21) If you draw four chips without replacement, what is the probability that at least one of the chips are not white? 
1 - p(no white) =  1 - 4red, 3red1blue, 2red2blue, 1 red3blue
                =1 - {{{ (5/15)(4/14)(3/13)(3/12) + (5/15)(4/14)(3/13)(3/12) + (5/15)(4/14)(3/13)(2/12) +(5/15)(3/14)(2/13)(1/12))}}}