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b = 4 = 3 + 4N - 4 = 4n -1
b. a = 21 Un = 21 + (n - 1)5
b = 5 = 21 + 5n - 5 = 5n + 16
c. a. = 2 Un = 2 + (n - 1)6
b = 6 = 2 + 6n - 6 = 6n -4
d. a = 40 Un = 40 + ( n -1)7
b = 7 = 40 + 7n -7 = 7n + 33