Question

1+2+3+4+5+6+7+.......50

Answer 1

an = 1+(n-1)1
50=1+n-1
n=50
now
S50=50/2(1+50)
=25×51
=1275

hope this helps u.

Answer 2

a=1, d=1 , n=50
sum=n/2 [2a+(n-1)d]
=25 [2+49]=25 [51]=1275



Hope it's helpful!!!!