Question

1+2+3+4+5+6+7+8+9+10​

Answer 1

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

we know that sum of number =

n (n+1)/2

n = 10

10 (10 + 1)/2

5*11

55