1
circle or write down the number in each list which is not a multiple of the first number listed.
a 3, 6, 9, 12, 14, 18, 21
b 11, 22, 33, 45, 55, 66
c 21.43.63, 84, 105
d 13, 26, 40.52, 65.

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.