Question

All sum formula of airthmetic progression ​

Answer 1

Answer:

a” as the first term, “d” the common difference between the terms, “n” is the total number of terms in the sequence

Explanation:

Hope that helps you

Answer 2

a_{n}=a_{1}+(n-1)d

a_n = the nᵗʰ term in the sequence

a_1 = the first term in the sequence

d = the common difference between terms