Question

Check wheather 500 is a term of list of number 1000,500,400 ...... find the sum

Answer 1

hope it helps

if it is wrong don't mind i tried to help

Step-by-step explanation:

a=1000

d=500-1000=(-500)

n=500

sn=n/2(2a+(n-1)d)

s₅₀₀= 500/2(2(1000)+499(-500)

=>250(2000-49500)

=>250(-47500)

=>11875000