Question

In an A.P, whose first term is ‘a’ and last term is‘1'​

Answer 1

Even in the case of odd numbers and even numbers, we can see the common difference between two successive terms will be equal to 2.

...

Formula Lists.

General Form of AP a, a + d, a + 2d, a + 3d, . . .

Sum of n terms in AP S = n/2[2a + (n − 1) × d]

Sum of all terms in a finite AP with the last term as 'l' n/2(a + l