Question

5,8,11,.....,50 find the sum of the following A.P​

Answer 1

Answer:

488 is the answer of the question

Answer 2

Step-by-step explanation:

$a = 5 \\ d = 8 - 5 = 3 \\ a_{n} = 50 \\ n = \\ \\ a_{n} =a + (n - 1)d \\ 50 = 5 + (n - 1)3 \\ 50 = 5 + 3n - 3 \\ 50 = 3n + 2 \\ 50 - 2 =3 n \\ 48 = 3n \\ n = 16 \\ \\ s_{n} = \frac{n}{2} (2a + (n - 1)d) \\ s_{n} = \frac{16}{2} (2 \times 5 + (16 - 1)3) \\ s_{n} = 8(10 + (15)3) \\ s_{n} = 8(10 + 45) \\ s_{n} = 8(55) \\ s_{n} = 440$