Answer :
sum of natural Numbers from 1 to n is given by the formula,
Sn = n(n + 1)/2
in your case n = 100
sum = 100(100 + 1)/2 = 50 × 101 = 5050
Sn = n(n + 1)/2
in your case n = 100
sum = 100(100 + 1)/2 = 50 × 101 = 5050
For an A.P. given, formula for its sum is:
[tex]S n=n/2 [a+l] [/tex]
where a = first term of A.P. and l=last term of A.P.
[tex]Sn=100/2 [1+100]=50(101)=5050[/tex]
[tex]S n=n/2 [a+l] [/tex]
where a = first term of A.P. and l=last term of A.P.
[tex]Sn=100/2 [1+100]=50(101)=5050[/tex]