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un = 2 + (n-1) 3
un = 2 + 3n - 3
un = 1 - 3n
Un-1 = a + (n-1)b -1
un = 2+ (n-1)3. -1
un = 2+ (n-1) -1
un = 2 + 3n + 1
Un = 3 + 3n
Un - Un-1
= 1-3n - 3 +3 n
= 3n - 3n - 3 +1
= 2