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U15 = a + (n-1) b
26 = 30 + 14b
26 - 30 = 14b
-4 = 14b
b = -2/7
Un = a + (n - 1) b
= 30 + (n-1) . -2/7
= 30 + -2/7 n + 2/7
= 210/7 + 2/7 - 2/7n
Un = 212/7 - 2/7n