Question

1+3+6+10+15+....+n terms =​

Answer 1

Hey

without the value of n how to find the answer

If someone can solve it please tell me

Answer 2

Answer:

Sn = n/2 ( 2a + (n-1)d )

Substituting the values

= n/2 (2n)

=n square or n^2

please mark as brainliest