If the sum of the first 15 natural numbers is subtracted from the sum of the first 20 natural numbers, what is the result?

Wed, 29 Apr 2026 17:44:35 +0000

**If the sum of the first 15 natural numbers is subtracted from the sum of the first 20 natural numbers, what is the result?** In today’s world of quick math challenges and digital curiosity, a straightforward question about arithmetic—“If the sum of the first 15 natural numbers is subtracted from the sum of the first 20 natural numbers, what is the result?”—has quietly gained attention across U.S. mobile devices. People are not just seeking answers; they’re drawn to understanding patterns that reveal how numbers build on one another. This kind of problem reflects a deeper rhythm in math: the contrast between growth and subtraction, engagement and precision. The key lies in applying the formula for the sum of the first *n* natural numbers: n(n + 1) / 2. Using this, the sum of the first 15 numbers becomes 15 × 16 / 2 = 120, and the sum of the first 20 is 20 × 21 / 2 = 210. When 120 is subtracted from 210, the result is 90. This outcome