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Sn = n/2(a+Un)
101=101/2(a+a+(101-1). 1)
202 = 101(2a+100)
202/101 = 2a + 100
2 -100 = 2a
-98=2a ... a= - 49
bilangan terbesar adalah U101 = a+(101-1).1. = - 49 +100 =51