Question

The sum of first n terms of an A.P with first term a and nth term l will be . a) 2 (2 − ) b) 2 (2 + ) c) 2 ( + ) d) 2 ( − )​

Answer 1

Step-by-step explanation:

dbxndnnfnfncbcbfnfnbcbcbcbcbcbcbcbbc

Answer 2

Step-by-step explanation:

$S_{n} = \frac{n}{2} (a + I)$