Math, asked by s128, 6 hours ago

please help me bro I will mark as brain list

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Answered by thoi4777

1

n=12

12×12/2+12/2

= 144/2+12/2

=156/2

=78

Answered by vivaintube

0

Answer:

78

Step-by-step explanation:

For step by step explanation, refer the below-attached image.

If it helps, do mark it as brainliest.

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