Question

To find the sum of first n-natural numbers by activity method​

Answer 1

Step-by-step explanation:

The sum of the first n terms of an AP is given by

Math Labs with Activity – Sum of the First n Natural Numbers 2 ….(i)

Taking a = 1 and d = 1, the AP becomes 1,2, 3, 4, …

∴ putting a =1 and d = 1 in equation (i), we get

Math Labs with Activity – Sum of the First n Natural Numbers 3

i.e., the sum of the first n natural numbers =

Math Labs with Activity – Sum of the First n Natural Numbers 4