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jadi rumus suku ke n = a+(11-1)b
a = S1 = 1/2(1+1) = 1/2 x 2 = 1
S2 = 1/2 x 2 (2+1) = 1 x 3 = 3
U2 = S2 - S1 = 3 - 1 = 2
b = U2 - a = 2 - 1 = 1
Un = a + (n-1)b
Un = 1 + (n-1) 2
Un = 1+ 2n - 2
Un = 2n - 1