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n(A)= 20
A = {1,2,3,4,5,6,8,10,12,15,16,20,24,30,40,48,60,80,120,240}
n(A)= 20
2) A ={2,3,4,6,12}
A= {×|×>1|,×€bilangan faktor dari 12}
3) 1/2+1/6+1/12+...+....+...
a = 1/2
r = 1/3
Sn = a/(1-r) = (1/2)/(1-1/3) = (1/2) / (2/3) = 1/2 x 3/2 = 3/4