Find the following sums :
`(i) 1 + 2 + 3 + …+ 30`
(ii) ` 1^(2) + 2^(2) + 3^(2) + …+35^(2)`
(ii)`1^(3) + 2^(3) + 3^(3) +…+ 20^(3)` .

Explanation

To solve the given sums, we will use specific formulas for the sums of natural numbers, squares of natural numbers, and cubes of natural numbers.

### Solution:

**(i) Find the sum of the first 30 natural numbers:**

The formula for the sum of the first \( n \) natural numbers is:
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