Question

3-{-2+(11-15)-[5+(-3+1)]+8}

Answer 1

3-{-2+(11-15)-[5+(-3+1)]+8}
3-{-2+(11-15)-[5-2]+8}
3-{-2+(11-15)-3+8}
3-{-2-4-3+8}
3-{-1}
3+1
4