Question

1+2+3+4+5... Accurate value ​

Answer 1

1+2+3+4+5 .......

= 15.....

Answer 2

Answer:

a=1

d=2-1=1

n =5

an=?

an=a+(n-1)d

=1+(5-1)1

=1+4

=5

sn=n/2 (a+an)

=5/2 (1+5)

=5/2 (6)

=5 (3)

=15