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a7 = a6 + 3 = a5 + 3 + 3 = a4+ 3 + 3 + 3 = ... = a1 + 6*3 = -7 + 18 = 11
b)
a_n - a_{n-1} = (a_{n-1} + 3) - a_{n-1} = 3 > 0 -> ciąg rośnie