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U30 = a + 29b
= a+(n-1) 11
= 13 + 11n - 11
Un = 2 + 11 n
U20 = 13 + ( 20-1) 11
= 13 + 209
= 221
U30 = 13 + (30-1) 11
= 13 + 319
= 332