What is the nth term of 1,3,6,10,15,21

1,3,6,10,15,21,…..

These are all the sum of natural numbers upto the n

So, in this series

1st Term = 1

2nd Term = 1+2 = 3

3rd Term = 1+2+3 = 6

4th Term = 1+2+3+4 = 10

So,

Term - n = 1+2+3+….+n = n(n+1)/2

That’s your answer n(n+1)/2

Good Luck

Step-by-step explanation:

look at the picture.

y-intercept for the function on a picture is 4 → point (0, 4).

y-intercept for the function

is for x = 0. substitute:

y-intercept is 8 → point (0, 8).