Question

Please what is the Explicit formula of this arithmetric sequence: 3, 7, 11, 15, 19

Answer 1

Let a be the first term and d the common difference

a = 3 d = 7 - 3 = 4

The nth tern of an arithmetric progression is given as

= a + (n - 1)d

= 3 + (n - 1)4

= 3 + 4n - 4

= 4n -1