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Un = a+(n-1)b
100 = 1 +(n-1)1
100 = 1+n-1
100=n
Sn = 50*101
Sn = 5050
Un = 100
maka
Sn = n/2 (a+Un)
S100 = 100/2 (1+100)
S100 = 50 (101)
S100 = 5050