Question

1+2+3+4+5+6+7+8+9+10+11+12+13+14+15..........+1000

Answer 1

Answer:500500

Step-by-step explanation:

1+2+3+4....+1000

Here

a=1

d=1

l=1000

So, l=a+(n-1)d

1000=1+(n-1)1

1000=1+n-1

1000=n

So;

Sum of n terms=(n/2)×(a+l)

=(1000/2)×(1+1000)

=500×1001

=500500