2 years ago

I'm lazy and dont feel like doing math myself. So pls help me!

Mathematics

1 answer:

vodomira [7]2 years ago

6 0

Answer:

Step-by-step explanation:

$\frac{n(n + 1)}{2} \\ n = 10 \\ substitutig \\ \frac{10(10 + 1)}{2} \\ \\ \frac{10(11)}{2} \\ \\ \frac{110}{2} = 55$

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