1 + 2 + 3 + ... + 12 = ? Options: A . &nbsp66 B . &nbsp68 C . &nbsp76 D . &nbsp78

1 + 2 + 3 + ... + 12

Question

1 + 2 + 3 + ... + 12 = ?

Options:

A . 66

B . 68

C . 76

D . 78

Answer: Option D

Answer : Option D

Explanation :

$MF#%1 + 2 + 3 + \cdots + n = \sum{n} = \dfrac{n(n+1)}{2}%$MF#%

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