Verify Whether $1 + 2 + 3 + \ldots + n = \frac { n } { 2 } ( n + 1 ) + 1$

Multiple Choice

Verify whether $1 + 2 + 3 + \ldots + n = \frac { n } { 2 } ( n + 1 ) + 1$ is true for $n = 1$ .

A) yes
B) no