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a= 1 ... b= 4-1=3
a+(n-1)b= un
1 + (n-1)3 = 79
1 + 3n - 3 = 79
3n = 79 +3-1
3n= 81
n= 27
b. a= 3 ... b= 4,5-3 = 1,5
a+(n-1)b= un
3 + (n-1)1,5 = 30
n-1) 1,5 = 30-3
1,5n - 1,5 = 27
1,5n = 28,5
n= 28,5 /1,5= 19