Question

Find+the+sum+of+the+numbers+from+1+to+18

Answer 1

Step-by-step explanation:

$\huge\bf{\mid{\overline{\underline{ANSWER:-}}\mid}}$

We will not simply count the numbers,

We'll find this using Arithmetic Progression

The following A. P will be

1,2,3........18

a = 1

d = 2 - 1 = 1

Using formula sum of n terms,

$S_n = \frac{n}{2} (2a + (n-1) d) \\ \\ S_{18} = 9 ( 2 + 17) \\ \\ S_{18} = 9 \times 19 \\ \\ \huge\boxed{S_{18} = 171}$