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

question 37

Multiple Choice

Verify the formula for $n = 1,2,3$ , and 4 . Is it correct?
$$5 + 10 + 15 \cdots + 5 n = \frac { 2 n ( n + 1 ) } { 2 }$$

• A) no
• B) yes

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