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Un = 7+(n-1)2 = 7 + 2(n-1) = 7 + 2n - 2 = 5 + 2n
U79 = 5 + 2n = 5 + ( 2 x 79) = 5 + 158 = 163
U151 = 5 + 2n = 5 +(2 x 151) = 5 + 302 = 307
b) 1/1, 1/2 , 1/3, 1/4, ....
Un = 1/n
U79 = 1/n = 1/79
U151 = 1/n = 1/151