두개뽑아서 더하기

function solution(numbers) {
    var answer = [];
    for(let i=0;i<numbers.length-1;i++){
        for(let j=i+1;j<numbers.length;j++){
            answer.push(numbers[i]+numbers[j]);
        }
    }
    answer=[...new Set(answer)].sort((a,b)=>a-b);
    return answer;
}