En una lista de números cada uno después del primero es igual al doble del inmediato anterior, si en el octavo lugar de la lista está el número 16 ¿Cuál es el número con el que inicia la lista?

step-by-step explanation:

the anwser is d) 75°

step-by-step explanation:

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for