Natural numbers are those numbers that include all positive integers excluding
0
.
The numbers from
1
to
100
are in A.P.
The formula for the sum of the first
n
natural number is
n
n
+
1
2
.
The number of natural numbers for the given series is
100
.
The sum of first
100
natural numbers is
100
100
+
1
2
=
50
×
101
=
5050
Hence the sum of first
100
natural numbers is
5050
.