The answer is 5050. This is because the natural numbers form a linear sequence of n = 100 elements with the initial value a = 1 and the difference of diff = 1. Applying the formula for the sum of linear sequence, we get sum = n / 2 × (2 × a + diff × (n - 1)) = 100 / 2 × (2 × 1 + 1 × (100 - 1)). It follows easily that sum = 5050. Read more