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b = 4
Un = 96
Sn = n/2 . (a + Un)
96 = n/2 (12+96)
96 = 54n
n = 1,7
b= 16-12= 4
n=( (un - a)/b) + 1
= (96 - 12)/4 + 1
= 84/4 + 1
= 21 + 1
n = 22