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Un = a + (n - 1).b
= 2 + (n - 1).2
= 2 + 2n - 2
= 2n
b) 1 ,2 ,3 ,4 ,5 ..... ⇒ a = 1 ; b = 2 - 1 = 1
Un = a + (n - 1).b
= 1 + (n - 1).1
= 1 + n - 1
= n
c) - 2 , 1 , 4 , 7 , 10 .... ⇒ a = - 2 ; b = 1 - (- 2) = 3
Un = a + (n - 1).b
= - 2 + (n - 1).3
= - 2 + 3n - 3
= 3n - 5