Question

Find the sum of first ten natural numbers.​

Answer 1

Step-by-step explanation:

1+2+3+4+5+6+7+8+9+10 =

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Answer 2

$sum = \frac{n}{2} (2a + (n - 1)d) \\ = \frac{10}{2} (2 \times 1 + 9 \times 1) \\ = 5(2 + 9) \\ = 55$

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