Find the sum of all the natural numbers from 21 to 50.

The correct answer is Option (1) → 1065

number of natural numbers from 21 to 50, n = 30

This is an Arithmetic Progression,

Thus, Sum of all natural number from 21 to 50 = \( {S}_{n} \) = \(\frac{n}{2}\) × [First term + Last term] = \(\frac{30}{2}\) × [21 + 50] = 1065