Question

Write the formula for n terms of AP whose 1st term is A and common difference is D.
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Answer 1

Answer:

Proof: 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]. ... Hence, the term preceding the last term is l – d.

Answer 2

Answer:

Tn={ A + (n-1) D}

Step-by-step explanation:

First term =A

Common difference = D

So, Tn = A+(n-1) D.