Find the average of 14, 15, 15, 17 18 and 20

the answer is 16.5

Step-by-step explanation:

add all the numbers up and divide by how many numbers that is there

, 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

first one because it can't have a fraction in it

step-by-step explanation: