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irina [24]
2 years ago
6

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:

55

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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