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

question 277

Multiple Choice

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

• A) yes
• B) no

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