Question

a=5. l=45 sn=650. find n. and. d​

Answer 1

Answer:

Sn = 650 = n/2 (a +l)

650 = n/2 ( 5+45)

650 = n/2 ( 50)

n = 26

l = a + (n-1)d

l = 5 + 25(d)

45 = 5 + 25(d)

25d = 40

d = 8/5 = 1.6

hope this will help you