Verify the Formula For $n = 1,2,3$ , and 4 Is It Correct

question 282

Multiple Choice

Verify the formula for $n = 1,2,3$ , and 4 . Is it correct?
$$2 + 4 + 6 \cdots + 2 n = \frac { 5 n ( n + 1 ) } { 2 }$$

• A) yes
• B) no

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