Question

1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+9+9+8+7+6+5+4+1+23

Answer 1

$\huge\bold{Answer:}$

1 + 1 + 2 + 2 + 3 + 3 + 4 + 4 + 5 + 5 + 6 + 6 + 7 + 7 + 8 + 9 + 9 + 8 + 7 + 6 + 5 + 4 + 1 + 23

= 136