Question

in an ap if the first term is a and the common difference d then the sum of its first n term is ​

Answer 1

Answer:

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Step-by-step explanation:

Suppose, a1, a2, a3, ……….. be an Arithmetic Progression whose first term is a and common difference is d. Therefore, S = n2[2a + (n - 1)d] = n2[a {a + (n - 1)d}] = n2[a + l]. We can also find find the sum of first n terms of an Arithmetic Progression according to the process below.

Answer 2

Step-by-step explanation:

sum of first n terms is:

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