Respuesta :

lollol

Answer:

(x * 3) + 1

Step-by-step explanation:

(1 * 3) + 1 = 4

(4 * 3) + 1 = 13

(13 * 3) + 1 = 40

etc

OneBusyBrain

Answer:

the next number is 3 times of previous number + 1

Step-by-step explanation:

like;

[tex]4 = (1) \times 3 + 1[/tex]

[tex]13 = (4) \times 3 + 1[/tex]

etc...