Question

The first and last term of an ap are 10 and 1000 and common difference is 10 how many terms are there and what is their sum

Answer 1

Answer:

n=100

sum=50500

Step-by-step explanation:

l(last term)=a+(n-1)d

1000=10+(n-1)10

1000=10+10n-10

1000=10n

therefore,n=1000

for the sum;

s=n/2(a+l)

s=100/2(10+1000)

s=50(1010)

therefore s=50500