Question

If x ==1+2+3+.......+2000 find the value of x

Answer 1

infinite is the value of x

Answer 2

x here is the sum of the following A.P so

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

here a=1,d=1

we can find n by

an=a+(n-1)d

2000=1+(n-1)1

2000=1+n-1

2000=n

x=2000/2(2*1+1999*1)

x=1000*2001

x=2001000