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U8 = a + (8-1)b
U8 = a + 7b
21 = a + 7b
U3 = a + (3-1)b
U3 = a + 2b
11 = a + 2b
a + 7b = 21
a + 2b = 11
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5b = 10
b = 2
a + 2b = 11
a + 2 × 2 = 11
a + 4 = 11
a = 11 - 4 = 7
a = suku pertama = 7
b = beda = 2