Question

answer this for free points
how much is 1+2+3+4+5+6+7+8+9+10​

Answer 1

Answer:

55 please mark as brainliest

Answer 2

Answer:

Let

$s = \: \: 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 \\ s = 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 \\ - - - - - - - - - - - - - - - - - - - - \\ 2s = 11 + 11 + ....10 \: times \\ 2s = 11 \times 10 \\ \\ s = \frac{110}{2} \\ \\ \pink{s = 55}$

Or Use formula for A.P. or

$\green{s = \frac{n(n + 1)}{2} }$