Question

what is 1+2+3+4+5+6+7+8+.............upto infinity

Answer 1

Hey


Is in in the form of AP .


where ,

a = 1


d = 1

let number of terms be n .


So ,

Sn = n / 2 [ 2 + ( n - 1 ) 1 ]


= n / 2 [ 2 + n - 1 ]

= n / 2 [ 1 + n ]


= n² + n / 2 .


But there is a mathematician , named Ramanujan .

He gave the concept that


1 + 2 + 3 + 4 + .........infinity

= -1 / 12

prove of this is a bit lendy .

if u want then do spread words in comment section .


thanks ^_^