How many strings of length 10 have. a) exactly three 0s?
C(10,3) = 120
b) more 0s than 1s?
10 0s : C(10,10) = 1 9 0s : C(10,9) = 10 8 0s : C(10,8) = 45 7 0s : C(10,7) = 120 6 0s : C(10,6) = 210
Total = 386
