All possible diagonal drawn from the two afjacent vertices A and B of a regular hectogon divides the hectogon's interior into a number of non- overlapping shapes -triangles and quadrilaterals (without any part of a line inside them). How many of these shapes are triangles? (a hectogon is a polygon with 100 sides)

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.