Question

Find the sum of first 100natural number

Answer 1

1st natural number = 1 =a
100th natural number =100=l
total numbers=100=n
Sum of 1st 100 natural number is
=
$\frac{n}{2} (a + l) \\ \frac{100}{2} (1 + 100) \\ 50 \times 51 = 2550$