Question

a=5 d=3 n=60
Find the sum of 60th term of this A.P​

Answer 1

Answer:

sn=5610✔✔

Step-by-step explanation:

□a=5✔✔

□d=3✔✔

□n=60✔✔

○sn=?

WE KNOW THE FORMULA OF SUM OF n th TERM AND WE HAVE ALL INFORMATION ABOUT THAT A.P

SO PUTTING VALUE ON BASIC FORMULA FOR SUM

$sn = \frac{n}{2} (2a + (n - 1) \times d) \\ \: \: \: \: \: \: = \frac{60}{2} (2 \times 5 + 59 \times 3) \\ \: \: \: \: \: \: = 30 \times (10 + 177) \\ \: \: \: \: \: \: = 30 \times 187 \\ \: \: \: \: \: \: = 5610$

Answer 2

$sn = \frac{n}{2} (2a + (n - 1) \times d) \\ \: \: \: \: \: \: = \frac{60}{2} (2 \times 5 + 59 \times 3) \\ \: \: \: \: \: \: = 30 \times (10 + 177) \\ \: \: \: \: \: \: = 30 \times 187 \\ \: \: \: \: \: \: = 5610$