Question

write the formula for finding the sum of n terms of an AP where the first term is 'a' , common difference is 'd' and last term is 'l'​

Answer 1

Answer:

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].

Step-by-step explanation:

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Answer 2

Answer:

sum of n th terms = n/2(a + l)